CVE-2026-87011 Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in back-channel logout

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.0 until 0.11.1, the unauthenticated POST /oauth/backchannel-logout handler in backend/openwebui/utils/oauth.py fetched the OIDC discovery document and signing keys before validating a submitted logout...