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      <title>CVE-2026-39976 — Laravel Passport's TokenGuard Authenticates Unrelated User for Client Credentials Tokens</title>
      <link>https://db.gcve.eu/vuln/cve-2026-39976</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; laravel passport&lt;/p&gt;
&lt;p&gt;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&amp;#39;s no user). The token guard then passes this value to retrieveById() without validating it&amp;#39;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; laravel passport&lt;/p&gt;
&lt;p&gt;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&amp;#39;s no user). The token guard then passes this value to retrieveById() without validating it&amp;#39;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.&lt;/p&gt;</content:encoded>
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