GHSA-3G9Q-V48F-HH9W Open WebUI: Unauthenticated requests can stall the server via uncached OIDC fetches in back-channel logout

Summary The OIDC back-channel logout endpoint is unauthenticated by design, because the identity provider calls it without a browser session. Before checking whether the submitted logout token was genuine, the handler fetched the provider's discovery document and its signing keys over the network...

PT-2026-89158

Name of the Vulnerable Software and Affected Versions Open WebUI versions 0.9.0 through 0.11.0 Description An asymmetric resource consumption issue exists in the OIDC back-channel logout handler. When the ENABLE OAUTH BACKCHANNEL LOGOUT setting is enabled and an OIDC provider is configured, the...