p PatchFirst

CVE-2026-87011

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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/open_webui/utils/oauth.py fetched the OIDC discovery document and signing keys before validating a submitted logout token. Each request repeated uncached network fetches, and the signing-key lookup blocked the async event loop, so requests carrying invalid tokens could stall the single-worker instance and amplify traffic to the identity provider when ENABLE_OAUTH_BACKCHANNEL_LOGOUT was enabled. This issue is fixed in version 0.11.1.

CVSS 7.5 · High · EPSS 0.6% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • open-webui

    Versions
    • >= 0.9.0, < 0.11.1: Affected

    No fix published

  • open-webui PyPI

    Versions
    • 0.10.0
    • 0.10.1
    • 0.10.2
    • 0.11.0
    • 0.9.0
    • 0.9.1
    • 0.9.2
    • 0.9.3
    • 0.9.4
    • 0.9.5
    • 0.9.6
    Affected ranges
    • ECOSYSTEM: ≥ 0.9.0, < 0.11.1

    Update to 0.11.1

Original sources

Check your server →