{"data":{"id":"5b8d7e03-844b-4ac2-981f-a24a48bec836","title":"GHSA-4g37-7p2c-38r9: Open WebUI Vulnerable to IDOR: Retrieval API Bypasses Knowledge Base Access Controls","summary":"Open WebUI's `_validate_collection_access()` checks only the `user-memory-*` and `file-*` collection name prefixes, so knowledge base collections named with raw UUIDs pass unchecked. Any authenticated non-admin user who knows a private knowledge base UUID can read its content through the `/api/v1/retrieval/query/doc` and `/api/v1/retrieval/query/collection` endpoints. The same gap lets an attacker write to another user's knowledge base through the `/api/v1/retrieval/process/*` endpoints, including overwriting content.","solution":"N/A -- no mitigation discussed in source.","labels":["security"],"sourceUrl":"https://github.com/advisories/GHSA-4g37-7p2c-38r9","publishedAt":"2026-05-14T20:26:42.000Z","cveId":"CVE-2026-45398","cweIds":null,"cvssScore":null,"cvssSeverity":"high","severity":"high","attackType":["other"],"issueType":"vulnerability","affectedPackages":["open-webui@<= 0.9.4 (fixed: 0.9.5)"],"affectedPackageNames":["open-webui"],"affectedPackageRefs":["pypi:open-webui"],"affectedVendors":[],"affectedVendorsRaw":["Open WebUI"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":null,"headlinePromptVersion":null,"cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":"unknown","epssScore":0.00489,"epssCheckedAt":"2026-10-23T12:08:28.237Z","kevDateAdded":null,"advisoryAliases":["GHSA-4g37-7p2c-38r9"],"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":true,"disclosureDate":"2026-05-14T20:26:42.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["confidentiality","integrity","availability"],"aiComponentTargeted":"rag","llmSpecific":false,"classifierConfidence":0.93,"researchCategory":null,"atlasIds":null}}