CVE-2026-88000

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    CVE-2026-88000

    Published: 9 Sept 2026Last Modified: 12 Sept 2026

    Summary: Open WebUI: Any authenticated user can hang the server via message deletion in a cyclic chat tree

    Details: Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.10.0 until 0.11.1, DELETE /api/v1/chats/{id}/messages/{message_id} used the chat-history deletion helper in backend/open_webui/models/chats.py to follow childrenIds without recording visited message identifiers. An authenticated user could store a cyclic chat tree and delete a message, causing a synchronous infinite loop on the server request loop that blocked every user's requests until the process was killed. 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/2026/88xxx/CVE-2026-88000.json, https://github.com/open-webui/open-webui/security/advisories/GHSA-3cgp-3cqx-j8w2, https://nvd.nist.gov/vuln/detail/CVE-2026-88000, https://github.com/open-webui/open-webui/commit/b933292d63d12be3fd1416fe55519ddc7aa336bc, https://github.com/open-webui/open-webui/pull/28035

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 4d2e13cf2bcc451b33bb6374bea4d2163e6cc94c
    Fixed -b933292d63d12be3fd1416fe55519ddc7aa336bc

    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-2026-88000 | CVE-DB