CVE-2026-87998

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    CVE-2026-87998

    Published: 9 Sept 2026Last Modified: 12 Sept 2026

    Summary: Open WebUI: Non-admin users can delete admin-owned external knowledge connections via knowledge base deletion

    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/knowledge/{id}/delete in backend/open_webui/routers/knowledge.py authorized deletion against the knowledge base but then removed its administrator-owned external connection without a separate administrator check or a check for other dependent knowledge bases. A non-administrator with write access to one external knowledge base could delete shared instance configuration and make every other knowledge base using that connection unavailable. 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-2026-87998.json, https://github.com/open-webui/open-webui/security/advisories/GHSA-2724-6cpj-gf3v, https://nvd.nist.gov/vuln/detail/CVE-2026-87998, https://github.com/open-webui/open-webui/commit/dc03e7e595d61be97b25a1dd7bb99ad264f73199, https://github.com/open-webui/open-webui/pull/28113

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 4d2e13cf2bcc451b33bb6374bea4d2163e6cc94c
    Fixed -dc03e7e595d61be97b25a1dd7bb99ad264f73199

    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-2026-87998 | CVE-DB