CRITICAL 9.1 CVE-2026-121802 Published 4 Nov 2026

Better Auth Expo Plugin Account Takeover Vulnerability

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The @better-auth/expo package before version 1.7.16 contains an account-takeover vulnerability because it signs a caller-supplied state value without checking whether that value was issued by the server.

This can result in serious impacts, including:

  • Unauthenticated changes of any account's email address
  • Other account-takeover outcomes

After updating to a fixed version, the application secret must be rotated.

Reference: CVE-2026-121802 on NVD

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