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    CVE-2026-45339

    Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, Open WebUI allows admins to restrict which API endpoints an API key can access. When an API key is restricted from /api/v1/messages, requests using the Authorization: Bearer sk-... header are correctly blocked with 403. However, the same key sent via the x-api-key header bypasses the restriction entirely — the request is authenticated, the model is invoked, and a full response is returned. This vulnerability is fixed in 0.9.0.

    Published:May 15, 2026
    Last Modified:May 19, 2026
    EPS:May 15, 2026
    EPSS Score:0.00026
    CVSS Score:6.5

    Affected Products

    Vendor
    Open-webui
    Product
    Open-webui
    Vendor
    Openwebui
    Product
    Open Webui

    Exploits

    https://github.com/open-webui/open-webui/security/advisories/GHSA-57q6-fvp4-pqmmhttps://github.com/open-webui/open-webui/security/advisories/GHSA-57q6-fvp4-pqmm

    Common Weakness Enumeration

    CWE-863 Incorrect Authorization

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    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