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      <title>CVE-2026-53518 — Better Auth OAuth Provider: Race Condition in Authorization Code Exchange Enables Multi-Use Code Redemption</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-53518</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; better-auth&lt;/p&gt;
&lt;p&gt;Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint for the authorization_code grant redeems a single-use authorization code through a non-atomic find-then-delete sequence, allowing two concurrent requests to pass the read step and mint independent access tokens, refresh tokens, and ID tokens; legacy /oauth2/token and /mcp/token paths in oidc-provider and mcp plugins share the same primitive. This issue is fixed in version 1.6.11.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; better-auth&lt;/p&gt;
&lt;p&gt;Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the @better-auth/oauth-provider POST /oauth2/token endpoint for the authorization_code grant redeems a single-use authorization code through a non-atomic find-then-delete sequence, allowing two concurrent requests to pass the read step and mint independent access tokens, refresh tokens, and ID tokens; legacy /oauth2/token and /mcp/token paths in oidc-provider and mcp plugins share the same primitive. This issue is fixed in version 1.6.11.&lt;/p&gt;</content:encoded>
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