id: PYSEC-2026-2707 published: "2026-07-13T15:15:42.174376Z" modified: "2026-07-13T16:05:11.228870Z" aliases: - CVE-2026-44557 - GHSA-6c2x-gcp3-gp73 summary: Open WebUI vulnerable to Global Knowledge Base Enumeration via knowledge-bases Meta-Collection details: "# Global Knowledge Base Enumeration via knowledge-bases Meta-Collection\n\n## Affected Component\n\nRetrieval collection access validation:\n- `backend/open_webui/routers/retrieval.py` (lines 2330-2355, `_validate_collection_access`)\n- `backend/open_webui/routers/retrieval.py` (query endpoints, e.g. `POST /query/doc`)\n\n## Affected Versions\n\nCurrent main branch (commit `6fdd19bf1`) and likely all versions with the knowledge base subsystem.\n\n## Description\n\nThe `_validate_collection_access` function uses an incomplete allowlist that only enforces ownership checks for collections matching `user-memory-*` and `file-*` patterns. All other collection names pass through unchecked — including the system-level `knowledge-bases` meta-collection, which stores the IDs, names, and descriptions of every knowledge base on the instance.\n\nAny authenticated user can query this meta-collection directly via the retrieval query endpoints to obtain a global index of all knowledge bases across all users.\n\n```python\n# retrieval.py:2330-2355 — incomplete collection allowlist\ndef _validate_collection_access(user, collection_name, ...):\n if collection_name.startswith('user-memory-'):\n # Check user-memory ownership\n ...\n elif collection_name.startswith('file-'):\n # Check file access\n ...\n # Everything else (including \"knowledge-bases\") passes through unchecked\n```\n\nThis finding is the enabler for the KB destruction (`process/web`), KB content injection (`process/file`), and RAG vector search access bypass findings — all of which require knowing a target KB's UUID. Without this enumeration, UUIDs are random and practically unguessable; with it, UUIDs across the entire instance are trivially obtained.\n\n## CVSS 3.1 Breakdown\n\n| Metric | Value | Rationale |\n|--------|-------|-----------|\n| Attack Vector | Network (N) | Exploited remotely via API call |\n| Attack Complexity | Low (L) | Single API call |\n| Privileges Required | Low (L) | Requires any authenticated user account |\n| User Interaction | None (N) | No victim interaction required |\n| Scope | Unchanged (U) | Impact within the knowledge base boundary |\n| Confidentiality | Low (L) | Discloses KB metadata (IDs, names, descriptions) across all users |\n| Integrity | None (N) | No direct data modification |\n| Availability | None (N) | No denial of service |\n\n## Attack Scenario\n\n1. Attacker (any authenticated user) sends:\n ```\n POST /api/v1/retrieval/query/doc\n {\n \"collection_name\": \"knowledge-bases\",\n \"query\": \"confidential\"\n }\n ```\n2. `_validate_collection_access` does not recognize the `knowledge-bases` prefix and lets the request pass.\n3. The vector search returns the most relevant documents from the meta-collection — knowledge base records including their UUIDs, names, and descriptions — across all users on the instance.\n4. Attacker varies the query to enumerate more KBs: `\"project\"`, `\"internal\"`, `\"private\"`, etc.\n5. Attacker now has a full target list for subsequent attacks (destruction, poisoning, content extraction).\n\n## Impact\n\n- **Information disclosure:** KB names and descriptions may reveal sensitive project names, internal initiatives, or user activities\n- **Enabler for other attacks:** Unlocks the following findings by supplying the required target UUIDs:\n - KB destruction/poisoning via `process/web`\n - Cross-user content injection via `process/file`\n - RAG vector search access bypass in `retrieval/utils.py`\n- Transforms these from theoretical (requires UUID guessing) to trivially exploitable (UUIDs enumerable)\n\n## Preconditions\n\n- Attacker must have a valid user account" affected: - package: name: open-webui ecosystem: PyPI purl: pkg:pypi/open-webui ranges: - type: ECOSYSTEM events: - introduced: "0" - fixed: 0.9.0 versions: - 0.1.124 - 0.1.125 - 0.2.0 - 0.2.1 - 0.2.2 - 0.2.3 - 0.2.4 - 0.2.5 - 0.3.0 - 0.3.1 - 0.3.10 - 0.3.12 - 0.3.13 - 0.3.14 - 0.3.15 - 0.3.16 - 0.3.17 - 0.3.17.dev2 - 0.3.17.dev3 - 0.3.17.dev4 - 0.3.17.dev5 - 0.3.18 - 0.3.19 - 0.3.2 - 0.3.20 - 0.3.21 - 0.3.22 - 0.3.23 - 0.3.24 - 0.3.25 - 0.3.26 - 0.3.27 - 0.3.27.dev1 - 0.3.27.dev2 - 0.3.27.dev3 - 0.3.28 - 0.3.29 - 0.3.3 - 0.3.30 - 0.3.30.dev1 - 0.3.30.dev2 - 0.3.31 - 0.3.31.dev1 - 0.3.32 - 0.3.33 - 0.3.33.dev1 - 0.3.34 - 0.3.35 - 0.3.4 - 0.3.5 - 0.3.6 - 0.3.7 - 0.3.8 - 0.3.9 - 0.4.0 - 0.4.0.dev1 - 0.4.0.dev2 - 0.4.1 - 0.4.2 - 0.4.3 - 0.4.4 - 0.4.5 - 0.4.6 - 0.4.6.dev1 - 0.4.7 - 0.4.8 - 0.5.0 - 0.5.0.dev1 - 0.5.0.dev2 - 0.5.1 - 0.5.10 - 0.5.11 - 0.5.12 - 0.5.13 - 0.5.14 - 0.5.15 - 0.5.16 - 0.5.17 - 0.5.18 - 0.5.19 - 0.5.2 - 0.5.20 - 0.5.3 - 0.5.3.dev1 - 0.5.4 - 0.5.5 - 0.5.6 - 0.5.7 - 0.5.8 - 0.5.9 - 0.6.0 - 0.6.1 - 0.6.10 - 0.6.11 - 0.6.12 - 0.6.13 - 0.6.14 - 0.6.15 - 0.6.16 - 0.6.18 - 0.6.19 - 0.6.2 - 0.6.20 - 0.6.21 - 0.6.22 - 0.6.23 - 0.6.24 - 0.6.25 - 0.6.26 - 0.6.26.dev1 - 0.6.27 - 0.6.28 - 0.6.29 - 0.6.3 - 0.6.30 - 0.6.31 - 0.6.32 - 0.6.33 - 0.6.34 - 0.6.35 - 0.6.36 - 0.6.37 - 0.6.38 - 0.6.39 - 0.6.4 - 0.6.40 - 0.6.41 - 0.6.42 - 0.6.43 - 0.6.5 - 0.6.6 - 0.6.6.dev1 - 0.6.7 - 0.6.8 - 0.6.9 - 0.7.0 - 0.7.1 - 0.7.2 - 0.8.0 - 0.8.1 - 0.8.10 - 0.8.11 - 0.8.12 - 0.8.2 - 0.8.3 - 0.8.4 - 0.8.5 - 0.8.6 - 0.8.7 - 0.8.8 - 0.8.9 references: - type: WEB url: https://github.com/open-webui/open-webui/security/advisories/GHSA-6c2x-gcp3-gp73 - type: ADVISORY url: https://nvd.nist.gov/vuln/detail/CVE-2026-44557 - type: PACKAGE url: https://github.com/open-webui/open-webui - type: PACKAGE url: https://pypi.org/project/open-webui - type: ADVISORY url: https://github.com/advisories/GHSA-6c2x-gcp3-gp73 severity: - type: CVSS_V3 score: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N