CVE-2026-39976

{
  "id": "CVE-2026-39976",
  "sourceIdentifier": "[email protected]",
  "published": "2026-04-09T17:16:31.267",
  "lastModified": "2026-10-26T21:10:00.170",
  "vulnStatus": "Analyzed",
  "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'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."
    },
    {
      "lang": "es",
      "value": "Laravel Passport proporciona soporte de servidor OAuth2 a Laravel. Desde la 13.0.0 hasta antes de la 13.7.1, existe una omisión de autenticación para los tokens de client_credentials. La biblioteca league/oauth2-server establece la declaración sub de JWT al identificador del cliente (ya que no hay usuario). El token guard luego pasa este valor a retrieveById() sin validar que es realmente un identificador de usuario, resolviendo potencialmente un usuario real no relacionado. Cualquier token de máquina a máquina puede autenticarse inadvertidamente como un usuario real. Esta vulnerabilidad está corregida en la 13.7.1."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "laravel",
          "product": "passport",
          "versions": [
            {
              "version": ">= 13.0.0, < 13.7.1",
              "status": "affected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "attackVector": "NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 4.7
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-04-09T17:38:00.854614Z",
          "id": "CVE-2026-39976",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ]
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "operator": "OR",
          "negate": false,
          "cpeMatch": [
            {
              "vulnerable": true,
              "criteria": "cpe:2.3:a:laravel:passport:*:*:*:*:*:laravel:*:*",
              "versionStartIncluding": "13.0.0",
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  "references": [
    {
      "url": "https://github.com/laravel/passport/issues/1900",
      "source": "[email protected]",
      "tags": [
        "Exploit",
        "Issue Tracking"
      ]
    },
    {
      "url": "https://github.com/laravel/passport/pull/1901",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking",
        "Patch"
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    },
    {
      "url": "https://github.com/laravel/passport/pull/1902",
      "source": "[email protected]",
      "tags": [
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        "Patch"
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    },
    {
      "url": "https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6",
      "source": "[email protected]",
      "tags": [
        "Mitigation",
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996",
      "source": "[email protected]",
      "tags": [
        "Issue Tracking",
        "Patch"
      ]
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  ]
}