CVE-2026-87011

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    CVE-2026-87011

    Published: 9 Sept 2026Last Modified: 12 Sept 2026

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

    Details: 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.

    References: https://github.com/open-webui/open-webui/releases/tag/v0.11.1, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/87xxx/CVE-2026-87011.json, https://github.com/open-webui/open-webui/security/advisories/GHSA-3g9q-v48f-hh9w, https://nvd.nist.gov/vuln/detail/CVE-2026-87011, https://github.com/open-webui/open-webui/commit/aeda6ff13a25d3b3ba1b303609f35382db22142c

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- f31768e20e5c6b4f6da0ef657877298b359936cf
    Fixed -aeda6ff13a25d3b3ba1b303609f35382db22142c

    Affected versions

    v0.11.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-87011 | CVE-DB