{"data":{"id":"3972b392-736f-409c-983c-737869f2ecc8","title":"GHSA-wch8-mhj5-9frg: Open WebUI: Cross-user file disclosure via /api/chat/completions image_url field","summary":"Open WebUI has a security flaw where authenticated users can access other users' files through the `/api/chat/completions` endpoint. When a user sends an image request with a file ID (instead of a web link) in the `image_url` field, the server reads that file from disk without checking if the user owns it, then converts it to a format the AI can process. An attacker can exploit this by using another user's file ID to make the AI read and describe private files, leaking their content.","solution":"N/A -- no mitigation discussed in source.","labels":["security"],"sourceUrl":"https://github.com/advisories/GHSA-wch8-mhj5-9frg","publishedAt":"2026-06-17T14:11:44.000Z","cveId":"CVE-2026-54009","cweIds":null,"cvssScore":null,"cvssSeverity":"medium","severity":"medium","attackType":["data_extraction"],"issueType":"vulnerability","affectedPackages":["open-webui@<= 0.9.5 (fixed: 0.9.6)"],"affectedVendors":[],"affectedVendorsRaw":["Open WebUI"],"classifierModel":"claude-haiku-4-5-20251001","classifierPromptVersion":"v3","cvssVector":null,"attackVector":null,"attackComplexity":null,"privilegesRequired":null,"userInteraction":null,"exploitMaturity":"unknown","epssScore":0,"patchAvailable":true,"disclosureDate":"2026-06-17T14:11:44.000Z","capecIds":null,"crossRefCount":0,"attackSophistication":"moderate","impactType":["confidentiality"],"aiComponentTargeted":"api","llmSpecific":true,"classifierConfidence":0.95,"researchCategory":null,"atlasIds":null}}