{"id":"CVE-2026-88005","aliases":["GHSA-4qg5-cxx4-g927"],"url":"https://o3.security/vulnerability/CVE-2026-88005","summary":"Open WebUI: Users denied by the OAuth domain allowlist or role policy can still sign in via token exchange","details":"Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.0 until 0.9.0, Open WebUI's OAuth token exchange endpoint issues a session for a provider access token without applying the email domain allowlist that the normal OAuth login callback enforces. An account whose email domain the login callback would refuse could still obtain a working session through this endpoint. This issue is fixed in version 0.9.0.","published":"2026-09-10T14:38:52.367Z","modified":"2026-09-11T03:48:23.417797213Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"open-webui","fixedVersion":"0.9.0"}],"fix":{"url":"https://github.com/open-webui/open-webui/commit/fb5ef978bfb451c3f2221931e08e54250cec58ca","label":"open-webui/open-webui@fb5ef97"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88005.json"},{"type":"FIX","url":"https://github.com/open-webui/open-webui/commit/fb5ef978bfb451c3f2221931e08e54250cec58ca"},{"type":"FIX","url":"https://github.com/open-webui/open-webui/pull/23639"},{"type":"ADVISORY","url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-4qg5-cxx4-g927"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88005"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-11T03:48:23.417797213Z"}}