{ "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-2026-29070", "tracking": { "current_release_date": "2026-04-01T18:28:44.496598Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-29070", "initial_release_date": "2026-03-27T00:25:17.480904Z", "revision_history": [ { "date": "2026-03-27T00:25:17.480904Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-27T00:25:21.336143Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-27T00:38:37.601499Z", "number": "3", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (1).| References created (1).| CWES updated (1)." }, { "date": "2026-03-27T00:38:49.411783Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-27T07:35:59.705456Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-27T21:03:42.288096Z", "number": "6", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-27T21:03:51.163886Z", "number": "7", "summary": "NCSC Score updated." }, { "date": "2026-03-28T07:41:33.746916Z", "number": "8", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (4).| CWES updated (1)." }, { "date": "2026-03-28T07:41:35.861347Z", "number": "9", "summary": "NCSC Score updated." }, { "date": "2026-03-30T12:38:42.433008Z", "number": "10", "summary": "Unknown change." }, { "date": "2026-03-30T12:38:44.310681Z", "number": "11", "summary": "NCSC Score updated." }, { "date": "2026-04-01T07:40:35.304900Z", "number": "12", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| Products connected (1)." }, { "date": "2026-04-01T07:40:38.110782Z", "number": "13", "summary": "NCSC Score updated." }, { "date": "2026-04-01T18:27:49.779383Z", "number": "14", "summary": "Products connected (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-04-01T18:27:51.591063Z", "number": "15", "summary": "NCSC Score updated." } ], "status": "interim", "version": "15" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<0.8.6", "product": { "name": "vers:unknown/<0.8.6", "product_id": "CSAFPID-5920657" } } ], "category": "product_name", "name": "open-webui" } ], "category": "vendor", "name": "open-webui" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<0.8.6", "product": { "name": "vers:unknown/<0.8.6", "product_id": "CSAFPID-5970944" } } ], "category": "product_name", "name": "open-webui" } ], "category": "vendor", "name": "unknown" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/<0.8.6", "product": { "name": "vers:unknown/<0.8.6", "product_id": "CSAFPID-5965493", "product_identification_helper": { "cpe": "cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:*" } } } ], "category": "product_name", "name": "open_webui" } ], "category": "vendor", "name": "openwebui" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-29070", "cwe": { "id": "CWE-862", "name": "Missing Authorization" }, "notes": [ { "category": "description", "text": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, an access control check is missing when deleting a file from a knowledge base. The only check being done is that the user has write access to the knowledge base (or is admin), but NOT that the file actually belongs to this knowledge base. It is thus possible to delete arbitrary files from arbitrary knowledge bases (as long as one knows the file id). Version 0.8.6 patches the issue.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-29070" }, { "category": "description", "text": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, an access control check is missing when deleting a file from a knowledge base. The only check being done is that the user has write access to the knowledge base (or is admin), but NOT that the file actually belongs to this knowledge base. It is thus possible to delete arbitrary files from arbitrary knowledge bases (as long as one knows the file id). Version 0.8.6 patches the issue.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/29xxx/CVE-2026-29070.json" }, { "category": "description", "text": "### Summary\nAn access control check is missing when deleting a file from a knowledge base. The only check being done is that the user has write access to the knowledge base (or is admin), but NOT that the file actually belongs to this knowledge base. It is thus possible to delete arbitrary files from arbitrary knowledge bases (as long as one knows the file id)\n\n### Details\nThe source code at https://github.com/open-webui/open-webui/blob/main/backend/open_webui/routers/knowledge.py#L803 does not properly validate that the file being deleted belongs to the current knowledge base:\n```\n@router.post(\"/{id}/file/remove\", response_model=Optional[KnowledgeFilesResponse])\ndef remove_file_from_knowledge_by_id(\n id: str,\n form_data: KnowledgeFileIdForm,\n delete_file: bool = Query(True),\n user=Depends(get_verified_user),\n db: Session = Depends(get_session),\n):\n knowledge = Knowledges.get_knowledge_by_id(id=id, db=db)\n [...]\n # Note : Access control check on the knowledge base\n if (\n knowledge.user_id != user.id\n and not AccessGrants.has_access(\n user_id=user.id,\n resource_type=\"knowledge\",\n resource_id=knowledge.id,\n permission=\"write\",\n db=db,\n )\n and user.role != \"admin\"\n ):\n raise HTTPException(\n status_code=status.HTTP_400_BAD_REQUEST,\n detail=ERROR_MESSAGES.ACCESS_PROHIBITED,\n )\n\n file = Files.get_file_by_id(form_data.file_id, db=db)\n [...]\n # Note : No checks on the file\n\n if delete_file:\n try:\n # Remove the file's collection from vector database\n file_collection = f\"file-{form_data.file_id}\"\n if VECTOR_DB_CLIENT.has_collection(collection_name=file_collection):\n VECTOR_DB_CLIENT.delete_collection(collection_name=file_collection)\n except Exception as e:\n log.debug(\"This was most likely caused by bypassing embedding processing\")\n log.debug(e)\n pass\n\n # Delete file from database\n Files.delete_file_by_id(form_data.file_id, db=db)\n[...]\n```\n\n### PoC\nVictim has a knowledge base with a file (id: 9db6dcee-bb3b-483e-aaf3-310fda366af1)\nAttacker creates their own collection (id: dde9e2b6-21c9-4aa1-a1cf-8cb0e4392f2b)\nAttacker deletes the victim file from their own collection:\n```\nPOST /api/v1/knowledge/dde9e2b6-21c9-4aa1-a1cf-8cb0e4392f2b/file/remove HTTP/1.1\nHost: gaius-neo-val.fr.space.corp\nAuthorization: Bearer eyJhbGciOiJIUzI1[...]nHiaod-3vfNE0\n[...]\n\n{\"file_id\":\"9db6dcee-bb3b-483e-aaf3-310fda366af1\"}\n\n-----\n\nHTTP/1.1 200 OK\n[...]\n```\nThe file is then deleted from the victim's knowledge base.\n\n\n### Impact\nArbitrary file deletion", "title": "github - https://api.github.com/advisories/GHSA-26gm-93rw-cchf" }, { "category": "description", "text": "Affected versions of the open-webui package are vulnerable to Missing Authorization due to a missing ownership check when deleting files from a knowledge base. The remove_file_from_knowledge_by_id function in backend/open_webui/routers/knowledge.py verifies that the user can write to the selected knowledge base, but it does not verify that form_data.file_id actually belongs to that knowledge base before calling Files.delete_file_by_id.", "title": "pyupio - https://raw.githubusercontent.com/pyupio/safety-db/refs/heads/master/data/insecure_full.json" }, { "category": "other", "text": "0.00031", "title": "EPSS" }, { "category": "other", "text": "3.2", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, There is exploit data available from source Nvd, Is related to an uncommon product vendor, Is related to a product by vendor Unknown", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5920657", "CSAFPID-5970944", "CSAFPID-5965493" ] }, "references": [ { "category": "external", "summary": "Source - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-29070" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/29xxx/CVE-2026-29070.json" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - github", "url": "https://api.github.com/advisories/GHSA-26gm-93rw-cchf" }, { "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", "url": "https://github.com/open-webui/open-webui/security/advisories/GHSA-26gm-93rw-cchf" }, { "category": "external", "summary": "Reference - github", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29070" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/open-webui/open-webui/blob/main/backend/open_webui/routers/knowledge.py#L803" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-26gm-93rw-cchf" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L", "baseScore": 5.4, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-5920657", "CSAFPID-5965493", "CSAFPID-5970944" ] } ], "title": "CVE-2026-29070" } ] }