CVE-2026-88005
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 Sep 10, 2026
- CVSS 6.5 medium
- 0.4% chance of exploitation in the next 30 days (EPSS)
- A fix is available