{"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's POST /api/chat/completions endpoint treats an image_url.url value that does not start with http://, https:// or data:image/ as a file id. convert_url_images_to_base64 then resolves it through Files.get_file_by_id, which has no ownership filter, so an authenticated user can read another user's file, base64-encode it and have the LLM describe it. The same class of flaw as CVE-2026-44560 persists because the file router's has_access_to_file checks were not applied to this conversion path.","solution":"N/A -- no mitigation discussed in source.","labels":["security","privacy"],"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","pii_leakage"],"issueType":"vulnerability","affectedPackages":["open-webui@<= 0.9.5 (fixed: 0.9.6)"],"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":0.00382,"epssCheckedAt":"2026-11-04T06:10:13.969Z","kevDateAdded":null,"advisoryAliases":["GHSA-wch8-mhj5-9frg"],"affectedPackagesSource":null,"affectedPackagesCheckedAt":null,"patchAvailable":true,"disclosureDate":"2026-06-17T14:11:44.000Z","fixReleasedAt":"2026-06-01T22:03:27.641Z","daysToFix":-16,"fixCheckedAt":"2026-10-29T21:34:23.146Z","capecIds":null,"crossRefCount":0,"attackSophistication":"trivial","impactType":["confidentiality"],"aiComponentTargeted":"api","llmSpecific":false,"classifierConfidence":0.9,"researchCategory":null,"atlasIds":null,"fixes":[{"ecosystem":"pypi","name":"open-webui","fixedVersion":"0.9.6","matchedVersion":"0.9.6","fixReleasedAt":"2026-06-01T22:03:27.641Z","daysToFix":-16,"match":"ecosystem","source":"tracked","status":"found","checkedAt":"2026-10-29T21:34:22.999Z"}]}}