FKIE_CVE-2026-39976

Vulnerability from fkie_nvd - Published: 2026-04-09 17:16 - Updated: 2026-04-13 15:02
Severity ?
7.1 (High) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Summary
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.
References
security-advisories@github.comhttps://github.com/laravel/passport/issues/1900
security-advisories@github.comhttps://github.com/laravel/passport/pull/1901
security-advisories@github.comhttps://github.com/laravel/passport/pull/1902
security-advisories@github.comhttps://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6
security-advisories@github.comhttps://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s no user). The token guard then passes this value to retrieveById() without validating it\u0027s 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."
    }
  ],
  "id": "CVE-2026-39976",
  "lastModified": "2026-04-13T15:02:27.760",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 4.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-09T17:16:31.267",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/laravel/passport/issues/1900"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/laravel/passport/pull/1901"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/laravel/passport/pull/1902"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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