Publish GHSA-349c-2h2f-mxf6

Author: advisory-database[bot]

advisories/github-reviewed/2026/04/GHSA-349c-2h2f-mxf6/GHSA-349c-2h2f-mxf6.json

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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-349c-2h2f-mxf6",
+  "modified": "2026-04-08T19:57:55Z",
+  "published": "2026-04-08T19:57:55Z",
+  "aliases": [],
+  "summary": "Laravel Passport: TokenGuard Authenticates Unrelated User for Client Credentials Tokens",
+  "details": "### Impact\nAuthentication 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.\n\n\nUsage of `EnsureClientIsResourceOwner` middleware together with `Passport::$clientUuids` set to `false`, can result in resolving the user instead, as stated in the [documentation](https://laravel.com/docs/13.x/passport#:~:text=The%20underlying%20OAuth2,client%20credentials%20token). \n\n> The [underlying OAuth2 server](https://oauth2.thephpleague.com/database-setup/#:~:text=Please%20note%20that,the%20bearer%20token.) sets the token's sub claim to the client's identifier for client credentials tokens. By default, Passport uses UUIDs for clients, so this cannot collide with a user's integer primary key. However, if you have set Passport::$clientUuids to false, a client credentials token may inadvertently resolve a user whose ID matches the client's ID. In such cases, using this middleware cannot guarantee that the incoming token is a client credentials token.\n\n### Patches\nPatched in v13.7.1\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\nDisallow usage of `client_credentials`. \n\n\n### References\n- https://github.com/laravel/passport/issues/1900\n- https://github.com/laravel/passport/pull/1901\n- https://github.com/laravel/passport/pull/1902\n- https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "Packagist",
+        "name": "laravel/passport"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "13.7.1"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/laravel/passport/security/advisories/GHSA-349c-2h2f-mxf6"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/laravel/passport/issues/1900"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/thephpleague/oauth2-server/issues/1456#issuecomment-2734989996"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/laravel/passport/pull/1901"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/laravel/passport/pull/1902"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/laravel/passport"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-287"
+    ],
+    "severity": "HIGH",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-04-08T19:57:55Z",
+    "nvd_published_at": null
+  }
+}