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      <title>CVE-2026-41427 — Better Auth OAuth 2.1 Provider: Unprivileged users can register OAuth clients</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-41427</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; better-auth, better-auth oauth-provider&lt;/p&gt;
&lt;p&gt;Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict client registration were not actually restricted — any authenticated user could reach the create endpoints and register an OAuth client with attacker-chosen redirect URIs and metadata. This vulnerability is fixed in 1.6.5.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; better-auth, better-auth oauth-provider&lt;/p&gt;
&lt;p&gt;Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict client registration were not actually restricted — any authenticated user could reach the create endpoints and register an OAuth client with attacker-chosen redirect URIs and metadata. This vulnerability is fixed in 1.6.5.&lt;/p&gt;</content:encoded>
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