{ "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-2026-27838", "tracking": { "current_release_date": "2026-04-01T09:54:07.218991Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-27838", "initial_release_date": "2026-02-26T22:38:44.218292Z", "revision_history": [ { "date": "2026-02-26T22:38:44.218292Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (1).| References created (2).| CWES updated (1)." }, { "date": "2026-02-26T22:38:46.214710Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-02-26T22:39:39.893159Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-02-26T22:39:42.980581Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-02-26T23:28:50.638580Z", "number": "5", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (2).| CWES updated (1)." }, { "date": "2026-02-26T23:28:59.100763Z", "number": "6", "summary": "NCSC Score updated." }, { "date": "2026-02-27T00:35:48.537808Z", "number": "7", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (14).| Product Identifiers created (14).| Products created (1).| References created (1).| CWES updated (1)." }, { "date": "2026-02-27T07:35:03.083410Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-02-27T14:37:07.274564Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-02-27T22:39:39.685551Z", "number": "10", "summary": "References created (2)." }, { "date": "2026-02-28T06:39:07.839365Z", "number": "11", "summary": "References created (2)." }, { "date": "2026-02-28T13:57:03.915812Z", "number": "12", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (18).| References created (4).| CWES updated (1)." }, { "date": "2026-03-02T16:38:29.210576Z", "number": "13", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| Products connected (1)." }, { "date": "2026-03-02T16:38:31.547837Z", "number": "14", "summary": "NCSC Score updated." }, { "date": "2026-03-03T01:25:21.111583Z", "number": "15", "summary": "Products created (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-03-03T01:25:23.379376Z", "number": "16", "summary": "NCSC Score updated." }, { "date": "2026-03-03T02:38:57.043189Z", "number": "17", "summary": "Unknown change." }, { "date": "2026-03-20T09:39:38.013519Z", "number": "18", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:39:41.456612Z", "number": "19", "summary": "NCSC Score updated." }, { "date": "2026-04-01T09:54:02.512774Z", "number": "20", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| Products connected (1)." }, { "date": "2026-04-01T09:54:05.505192Z", "number": "21", "summary": "NCSC Score updated." } ], "status": "interim", "version": "21" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<=2.1", "product": { "name": "vers:unknown/<=2.1", "product_id": "CSAFPID-5753709" } } ], "category": "product_name", "name": "wger" } ], "category": "vendor", "name": "unknown" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<=2.4", "product": { "name": "vers:unknown/<=2.4", "product_id": "CSAFPID-5755247", "product_identification_helper": { "cpe": "cpe:2.3:a:wger:wger:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "wger" } ], "category": "vendor", "name": "wger" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/1.0", "product": { "name": "vers:unknown/1.0", "product_id": "CSAFPID-4235454" } }, { "category": "product_version_range", "name": "vers:unknown/1.0.1", "product": { "name": "vers:unknown/1.0.1", "product_id": "CSAFPID-4235455" } }, { "category": "product_version_range", "name": "vers:unknown/1.0.2", "product": { "name": "vers:unknown/1.0.2", "product_id": "CSAFPID-4235456" } }, { "category": "product_version_range", "name": "vers:unknown/1.0.3", "product": { "name": "vers:unknown/1.0.3", "product_id": "CSAFPID-4235457" } }, { "category": "product_version_range", "name": "vers:unknown/1.1", "product": { "name": "vers:unknown/1.1", "product_id": "CSAFPID-3273248", "product_identification_helper": { "purl": "pkg:pypi/wger@1.1" } } }, { "category": "product_version_range", "name": "vers:unknown/1.1.1", "product": { "name": "vers:unknown/1.1.1", "product_id": "CSAFPID-3273249", "product_identification_helper": { "purl": "pkg:pypi/wger@1.1.1" } } }, { "category": "product_version_range", "name": "vers:unknown/1.2", "product": { "name": "vers:unknown/1.2", "product_id": "CSAFPID-3273250", "product_identification_helper": { "purl": "pkg:pypi/wger@1.2" } } }, { "category": "product_version_range", "name": "vers:unknown/1.2rc1", "product": { "name": "vers:unknown/1.2rc1", "product_id": "CSAFPID-3273251", "product_identification_helper": { "purl": "pkg:pypi/wger@1.2rc1" } } }, { "category": "product_version_range", "name": "vers:unknown/1.3", "product": { "name": "vers:unknown/1.3", "product_id": "CSAFPID-3273252", "product_identification_helper": { "purl": "pkg:pypi/wger@1.3" } } }, { "category": "product_version_range", "name": "vers:unknown/1.4", "product": { "name": "vers:unknown/1.4", "product_id": "CSAFPID-3273253", "product_identification_helper": { "purl": "pkg:pypi/wger@1.4" } } }, { "category": "product_version_range", "name": "vers:unknown/1.5", "product": { "name": "vers:unknown/1.5", "product_id": "CSAFPID-3273254", "product_identification_helper": { "purl": "pkg:pypi/wger@1.5" } } }, { "category": "product_version_range", "name": "vers:unknown/1.6", "product": { "name": "vers:unknown/1.6", "product_id": "CSAFPID-3273255", "product_identification_helper": { "purl": "pkg:pypi/wger@1.6" } } }, { "category": "product_version_range", "name": "vers:unknown/1.6.1", "product": { "name": "vers:unknown/1.6.1", "product_id": "CSAFPID-3273256", "product_identification_helper": { "purl": "pkg:pypi/wger@1.6.1" } } }, { "category": "product_version_range", "name": "vers:unknown/1.7", "product": { "name": "vers:unknown/1.7", "product_id": "CSAFPID-3273257", "product_identification_helper": { "purl": "pkg:pypi/wger@1.7" } } }, { "category": "product_version_range", "name": "vers:unknown/1.8", "product": { "name": "vers:unknown/1.8", "product_id": "CSAFPID-3273258", "product_identification_helper": { "purl": "pkg:pypi/wger@1.8" } } }, { "category": "product_version_range", "name": "vers:unknown/1.9", "product": { "name": "vers:unknown/1.9", "product_id": "CSAFPID-3273259", "product_identification_helper": { "purl": "pkg:pypi/wger@1.9" } } }, { "category": "product_version_range", "name": "vers:unknown/2.0", "product": { "name": "vers:unknown/2.0", "product_id": "CSAFPID-3273260", "product_identification_helper": { "purl": "pkg:pypi/wger@2.0" } } }, { "category": "product_version_range", "name": "vers:unknown/2.1", "product": { "name": "vers:unknown/2.1", "product_id": "CSAFPID-3273261", "product_identification_helper": { "purl": "pkg:pypi/wger@2.1" } } }, { "category": "product_version_range", "name": "vers:unknown/2.2", "product": { "name": "vers:unknown/2.2", "product_id": "CSAFPID-5734576" } }, { "category": "product_version_range", "name": "vers:unknown/2.3", "product": { "name": "vers:unknown/2.3", "product_id": "CSAFPID-5734577" } }, { "category": "product_version_range", "name": "vers:unknown/2.4", "product": { "name": "vers:unknown/2.4", "product_id": "CSAFPID-5734578" } }, { "category": "product_version_range", "name": "vers:unknown/<=2.4", "product": { "name": "vers:unknown/<=2.4", "product_id": "CSAFPID-5733128" } }, { "category": "product_version_range", "name": "vers:unknown/>=0|<=2.1", "product": { "name": "vers:unknown/>=0|<=2.1", "product_id": "CSAFPID-5733683" } } ], "category": "product_name", "name": "wger" } ], "category": "vendor", "name": "wger-project" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-27838", "cwe": { "id": "CWE-639", "name": "Authorization Bypass Through User-Controlled Key" }, "notes": [ { "category": "description", "text": "wger is a free, open-source workout and fitness manager. Five routine detail action endpoints check a cache before calling `self.get_object()`. In versions up to and including 2.4, ache keys are scoped only by `pk` — no user ID is included. When a victim has previously accessed their routine via the API, an attacker can retrieve the cached response for the same PK without any ownership check. Commit e964328784e2ee2830a1991d69fadbce86ac9fbf contains a patch for the issue.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-27838" }, { "category": "description", "text": "### Summary\n\nFive routine detail action endpoints check a cache before calling `self.get_object()`. Cache keys are scoped only by `pk` — no user ID is included. When a victim has previously accessed their routine via the API, an attacker can retrieve the cached response for the same PK without any ownership check.\n\n### Details\n\n`wger/manager/api/views.py` — five actions follow this pattern (lines 134–201):\n\n```python\n@action(detail=True)\ndef date_sequence_display_mode(self, request, pk=None):\n cache_key = make_routine_api_date_sequence_display_cache_key(pk)\n cached = cache.get(cache_key)\n if cached:\n return Response(cached) # returned WITHOUT calling self.get_object()\n # only reaches ownership check on cache miss\n routine = self.get_object()\n ...\n```\n\nCache key construction in `wger/utils/cache.py:89–106`:\n\n```python\ndef make_routine_api_date_sequence_display_cache_key(routine_id):\n return f\"routine-api-date-sequence-display-{routine_id}\"\n # No user ID in key\n```\n\nCache TTL: 1 month (`4 * 604800` seconds, `settings_global.py:461`).\n\nAffected endpoints:\n```\nGET /api/v2/routine/{pk}/date-sequence-display/\nGET /api/v2/routine/{pk}/date-sequence-gym/\nGET /api/v2/routine/{pk}/structure/\nGET /api/v2/routine/{pk}/logs/\nGET /api/v2/routine/{pk}/stats/\n```\n\n### PoC\n\n```\n1. Victim (user A) visits GET /api/v2/routine/5/structure/ → response cached under key \"routine-api-structure-5\"\n2. Attacker (user B) visits GET /api/v2/routine/5/structure/ → cache hit → returns user A's routine structure without any ownership check\n```\n\nRequires the victim to have previously accessed the endpoint (cache must be populated). Once populated, the cache entry is valid for 1 month.\n\n### Impact\n\nAn attacker with a registered account can retrieve another user's routine details — workout day sequences, exercise structure, training logs, and statistics — from cache without ownership verification.\n\n**Fix**: Include the user ID in the cache key:\n```python\ndef make_routine_api_date_sequence_display_cache_key(routine_id, user_id):\n return f\"routine-api-date-sequence-display-{user_id}-{routine_id}\"\n```\n\nOr move `self.get_object()` before the cache lookup so ownership is always verified first.", "title": "github - https://github.com/advisories/GHSA-42cr-w2gr-m54q" }, { "category": "description", "text": "wger is a free, open-source workout and fitness manager. Five routine detail action endpoints check a cache before calling `self.get_object()`. In versions up to and including 2.4, ache keys are scoped only by `pk` — no user ID is included. When a victim has previously accessed their routine via the API, an attacker can retrieve the cached response for the same PK without any ownership check. Commit e964328784e2ee2830a1991d69fadbce86ac9fbf contains a patch for the issue.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-27838" }, { "category": "description", "text": "### Summary\n\nFive routine detail action endpoints check a cache before calling `self.get_object()`. Cache keys are scoped only by `pk` — no user ID is included. When a victim has previously accessed their routine via the API, an attacker can retrieve the cached response for the same PK without any ownership check.\n\n### Details\n\n`wger/manager/api/views.py` — five actions follow this pattern (lines 134–201):\n\n```python\n@action(detail=True)\ndef date_sequence_display_mode(self, request, pk=None):\n cache_key = make_routine_api_date_sequence_display_cache_key(pk)\n cached = cache.get(cache_key)\n if cached:\n return Response(cached) # returned WITHOUT calling self.get_object()\n # only reaches ownership check on cache miss\n routine = self.get_object()\n ...\n```\n\nCache key construction in `wger/utils/cache.py:89–106`:\n\n```python\ndef make_routine_api_date_sequence_display_cache_key(routine_id):\n return f\"routine-api-date-sequence-display-{routine_id}\"\n # No user ID in key\n```\n\nCache TTL: 1 month (`4 * 604800` seconds, `settings_global.py:461`).\n\nAffected endpoints:\n```\nGET /api/v2/routine/{pk}/date-sequence-display/\nGET /api/v2/routine/{pk}/date-sequence-gym/\nGET /api/v2/routine/{pk}/structure/\nGET /api/v2/routine/{pk}/logs/\nGET /api/v2/routine/{pk}/stats/\n```\n\n### PoC\n\n```\n1. Victim (user A) visits GET /api/v2/routine/5/structure/ → response cached under key \"routine-api-structure-5\"\n2. Attacker (user B) visits GET /api/v2/routine/5/structure/ → cache hit → returns user A's routine structure without any ownership check\n```\n\nRequires the victim to have previously accessed the endpoint (cache must be populated). Once populated, the cache entry is valid for 1 month.\n\n### Impact\n\nAn attacker with a registered account can retrieve another user's routine details — workout day sequences, exercise structure, training logs, and statistics — from cache without ownership verification.\n\n**Fix**: Include the user ID in the cache key:\n```python\ndef make_routine_api_date_sequence_display_cache_key(routine_id, user_id):\n return f\"routine-api-date-sequence-display-{user_id}-{routine_id}\"\n```\n\nOr move `self.get_object()` before the cache lookup so ownership is always verified first.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/PyPI%2FGHSA-42cr-w2gr-m54q.json?alt=media" }, { "category": "description", "text": "wger is a free, open-source workout and fitness manager. Five routine detail action endpoints check a cache before calling `self.get_object()`. In versions up to and including 2.4, ache keys are scoped only by `pk` — no user ID is included. When a victim has previously accessed their routine via the API, an attacker can retrieve the cached response for the same PK without any ownership check. Commit e964328784e2ee2830a1991d69fadbce86ac9fbf contains a patch for the issue.", "title": "osv - https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-27838.json?alt=media" }, { "category": "description", "text": "Affected versions of the wger package are vulnerable to Information Disclosure because user-unscoped cache keys are generated using only the routine pk, without including a user identifier. In wger/manager/api/views.py, the @action(detail=True) handlers date_sequence_display_mode, date_sequence_gym, structure, logs, and stats return cache.get(make_routine_api_*_cache_key(pk)) results directly (skipping self.get_object() and its ownership check) because wger/utils/cache.py builds keys like routine-api-structure-{routine_id} without user scoping, and the cached response can persist for about one month.", "title": "pyupio - https://pyupio.github.io/safety-db/#wger" }, { "category": "description", "text": "Affected versions of the wger package are vulnerable to Information Disclosure because user-unscoped cache keys are generated using only the routine pk, without including a user identifier. In wger/manager/api/views.py, the @action(detail=True) handlers date_sequence_display_mode, date_sequence_gym, structure, logs, and stats return cache.get(make_routine_api_*_cache_key(pk)) results directly (skipping self.get_object() and its ownership check) because wger/utils/cache.py builds keys like routine-api-structure-{routine_id} without user scoping, and the cached response can persist for about one month.", "title": "pyupio - https://raw.githubusercontent.com/pyupio/safety-db/refs/heads/master/data/insecure_full.json" }, { "category": "other", "text": "0.00027", "title": "EPSS" }, { "category": "other", "text": "3.4", "title": "NCSC Score" }, { "category": "other", "text": "Is related to a product by vendor Unknown, There is exploit data available from source Nvd, The value of the most recent CVSS (V3) score", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5733128", "CSAFPID-3273248", "CSAFPID-3273249", "CSAFPID-3273250", "CSAFPID-3273251", "CSAFPID-3273252", "CSAFPID-3273253", "CSAFPID-3273254", "CSAFPID-3273255", "CSAFPID-3273256", "CSAFPID-3273257", "CSAFPID-3273258", "CSAFPID-3273259", "CSAFPID-3273260", "CSAFPID-3273261", "CSAFPID-5733683", "CSAFPID-4235454", "CSAFPID-4235455", "CSAFPID-4235456", "CSAFPID-4235457", "CSAFPID-5734576", "CSAFPID-5734577", "CSAFPID-5734578", "CSAFPID-5753709", "CSAFPID-5755247" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-27838" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/27xxx/CVE-2026-27838.json" }, { "category": "external", "summary": "Source - github", "url": "https://github.com/advisories/GHSA-42cr-w2gr-m54q" }, { "category": "external", "summary": "Source raw - github", "url": "https://api.github.com/advisories/GHSA-42cr-w2gr-m54q" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27838" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-27838" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/PyPI%2FGHSA-42cr-w2gr-m54q.json?alt=media" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-27838" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - osv", "url": "https://www.googleapis.com/download/storage/v1/b/osv-vulnerabilities/o/GIT%2FCVE-2026-27838.json?alt=media" }, { "category": "external", "summary": "Source - pyupio", "url": "https://pyupio.github.io/safety-db/#wger" }, { "category": "external", "summary": "Source raw - pyupio", "url": "https://raw.githubusercontent.com/pyupio/safety-db/refs/heads/master/data/insecure_full.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - pyupio", "url": "https://raw.githubusercontent.com/pyupio/safety-db/refs/heads/master/data/insecure_full.json" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv", "url": "https://github.com/wger-project/wger/security/advisories/GHSA-42cr-w2gr-m54q" }, { "category": "external", "summary": "Reference - cveprojectv5; github; nvd; osv", "url": "https://github.com/wger-project/wger/commit/e964328784e2ee2830a1991d69fadbce86ac9fbf" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-42cr-w2gr-m54q" }, { "category": "external", "summary": "Reference - github; osv", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27838" }, { "category": "external", "summary": "Reference - osv", "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27838.json" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N", "baseScore": 3.1, "baseSeverity": "LOW" }, "products": [ "CSAFPID-3273248", "CSAFPID-3273249", "CSAFPID-3273250", "CSAFPID-3273251", "CSAFPID-3273252", "CSAFPID-3273253", "CSAFPID-3273254", "CSAFPID-3273255", "CSAFPID-3273256", "CSAFPID-3273257", "CSAFPID-3273258", "CSAFPID-3273259", "CSAFPID-3273260", "CSAFPID-3273261", "CSAFPID-4235454", "CSAFPID-4235455", "CSAFPID-4235456", "CSAFPID-4235457", "CSAFPID-5733128", "CSAFPID-5733683", "CSAFPID-5734576", "CSAFPID-5734577", "CSAFPID-5734578", "CSAFPID-5753709", "CSAFPID-5755247" ] } ], "title": "CVE-2026-27838" } ] }