Open WebUI: Authenticated users can bypass model access control via exposed query parameter_CVE-2026-45365

{
    "lastseen": "",
    "description": "Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.8.11, an internal-only bypass_filter parameter is exposed on the /openai/chat/completions and /ollama/api/chat HTTP endpoints via FastAPI query string binding, allowing any authenticated user to append ?bypass_filter=true and bypass model access control checks to invoke admin-restricted models. This vulnerability is fixed in 0.8.11.",
    "published": "2026-05-15T21:07:12.449Z",
    "modified": "2026-05-15T21:07:12.449Z",
    "type": "cve",
    "title": "Open WebUI: Authenticated users can bypass model access control via exposed query parameter",
    "source": "GitHub_M",
    "references": "https://github.com/open-webui/open-webui/security/advisories/GHSA-v6qf-75pr-p96m",
    "id": "CVE-2026-45365",
    "bulletinFamily": "",
    "cwe": [
        "CWE-285"
    ],
    "cvelist": null,
    "sourceData": "open-webui open-webui < 0.8.11",
    "sourceHref": "",
    "cvss": {
        "score": 5.4,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "open-webui",
    "version": "< 0.8.11",
    "vendor": "open-webui",
    "ai_description": "",
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    "ai_score": 0
}