Laravel Passport’s TokenGuard Authenticates Unrelated User for Client Credentials Tokens_CVE-2026-39976

{
    "lastseen": "",
    "description": "Laravel Passport provides OAuth2 server support to Laravel. From 13.0.0 to before 13.7.1, there is an Authentication Bypass for client_credentials tokens. the league/oauth2-server library sets the JWT sub claim to the client identifier (since there's no user). The token guard then passes this value to retrieveById() without validating it's actually a user identifier, potentially resolving an unrelated real user. Any machine-to-machine token can inadvertently authenticate as an actual user. This vulnerability is fixed in 13.7.1.",
    "published": "2026-04-09T16:50:42.326Z",
    "modified": "2026-04-09T19:31:53.801Z",
    "type": "cve",
    "title": "Laravel Passport's TokenGuard Authenticates Unrelated User for Client Credentials Tokens",
    "source": "GitHub_M",
    "references": "https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6\nhttps://github.com/laravel/passport/issues/1900\nhttps://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996\nhttps://github.com/laravel/passport/pull/1901\nhttps://github.com/laravel/passport/pull/1902",
    "id": "CVE-2026-39976",
    "bulletinFamily": "",
    "cwe": [
        "CWE-287"
    ],
    "cvelist": null,
    "sourceData": "laravel passport >= 13.0.0, < 13.7.1",
    "sourceHref": "",
    "cvss": {
        "score": 7.1,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "passport",
    "version": ">= 13.0.0, < 13.7.1",
    "vendor": "laravel",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}