{"id":"CVE-2026-70486","aliases":["GHSA-3xpf-xq7r-v8c5","PYSEC-2026-3641"],"url":"https://o3.security/vulnerability/CVE-2026-70486","summary":"Open WebUI: Same-origin XSS to account takeover via terminal file-preview iframe hardcoding allow-same-origin","details":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.0, the terminal file-preview serveUrl iframe branch always granted allow-same-origin together with allow-scripts for HTML files served from the application origin. Any authenticated user with access to a configured terminal server could cause script in a previewed file to run in the Open WebUI origin, read the victim's session token from localStorage, and take over the account, with possible server-side code execution if the victim was an admin or held workspace.functions. This issue is fixed in 0.11.0.","published":"2026-08-04T20:01:55.319Z","modified":"2026-09-10T03:30:48.539069518Z","cvss":{"score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"},"epss":{"score":0.00374,"percentile":0.31159,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"open-webui","fixedVersion":"0.11.0"}],"fix":{"url":"https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c","label":"open-webui/open-webui@65a5fad"},"references":[{"type":"WEB","url":"https://github.com/open-webui/open-webui/releases/tag/v0.11.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/70xxx/CVE-2026-70486.json"},{"type":"ADVISORY","url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-3xpf-xq7r-v8c5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-70486"},{"type":"FIX","url":"https://github.com/open-webui/open-webui/commit/65a5fad7b97db99d490d81f4e0860282c3a4543c"},{"type":"FIX","url":"https://github.com/open-webui/open-webui/pull/26907"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T03:30:48.539069518Z"}}