{"id":"CVE-2026-45675","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-45675","generatedAt":"2026-10-28T09:42:23.860Z","title":"This vulnerability is fixed in 0.9.0.","description":"Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the LDAP and OAuth authentication flows use a TOCTOU (Time-of-Check-Time-of-Use) pattern for first-user admin role assignment. The regular signup handler (signup_handler in auths.py, line 663) was explicitly patched to prevent this race with the comment \"Insert with default role first to avoid TOCTOU race\", but the LDAP and OAuth code paths were never updated with the same fix. This vulnerability is fixed in 0.9.0.","published":"2026-05-15T20:16:49.000Z","lastModified":"2026-06-18T22:16:31.000Z","status":"Modified","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-269","CWE-362"],"affected":["openwebui/open webui"],"epss":{"score":0.00354,"percentile":0.28898,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.35%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/open-webui/open-webui/commit/96a0b3239b1aadb23fc359bf10849c9ba12fd6ec","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/pull/23626","tags":["Issue Tracking"],"source":"security-advisories@github.com"},{"url":"https://github.com/open-webui/open-webui/security/advisories/GHSA-h3ww-q6xx-w7x3","tags":["Exploit","Mitigation","Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-45675","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}