{"schema":"threatline.record/2","record":{"id":"CVE-2026-109290","aliases":["GHSA-f9xp-mfmq-x6cg"],"summary":"Open WebUI 0.11.1 before 0.11.4 Stored XSS via DOCX Preview","details":"Open WebUI from 0.11.1 before 0.11.4 contains a stored cross-site scripting vulnerability in DocxPreview.svelte that allows authenticated users to execute script by uploading crafted DOCX attachments. Attackers can embed an OOXML altChunk HTML part or script-scheme hyperlink to steal a previewing administrator's session token from local storage and take over the instance.","categories":["Unclassified"],"product":"open-webui","vendor":"open-webui","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-109290","source_modified_at":"2026-10-23T21:57:53.874Z","fetched_at":"2026-10-23T22:01:05.715934Z","product":"open-webui","vendor":"open-webui","versions":[{"version":"0.11.1","status":"affected","versionType":"semver","lessThan":"0.11.4"},{"version":"0.11.4","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-109290","source_modified_at":"2026-10-23T21:57:53.874Z","fetched_at":"2026-10-23T22:01:05.715934Z","package":{"name":"open-webui","ecosystem":null},"version":"0.11.4","basis":"first unaffected version stated in the CVE record"}],"cvss":8.4,"severity":"High","kev":{"listed":false},"epss":{"probability":0.00255,"percentile":0.16219,"score_date":"2026-10-23"},"published_at":"2026-10-12T16:04:51.655Z","modified_at":"2026-10-23T21:57:53.874Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-109290","fetched_at":"2026-10-23T22:01:05.715934Z","source_modified_at":"2026-10-23T21:57:53.874Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-109290","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-f9xp-mfmq-x6cg","tags":["exploit"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/open-webui-0.11.1-before-0.11.4-stored-xss-via-docx-preview","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"total","assessed_at":"2026-10-13T18:07:52.173676Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-23T21:57:53.874Z","content_hash":"fe30c21bfdee580fd6f18af681f6bb3a0e92c259fcd9a4f62e7dafb636ac4ffd"}}