CVE-2026-53514

Summary

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, and in 1.6.14 and later when invitation IDs can be obtained outside the invited mailbox and requireEmailVerificationOnInvitation: true is not enabled, the organization plugin's acceptInvitation, rejectInvitation, getInvitation, and listUserInvitations recipient endpoints use session.user.email and an invitation ID without sufficient verified-email ownership proof, allowing a user with an unverified session for the invited email address to accept an organization invitation after obtaining the invitation ID. This issue is fixed for the original default behavior in version 1.6.11, while 1.6.14 restored compatibility for built-in opaque invitation IDs and leaves affected configurations requiring secure options.

Affected Software

VendorProductVersion RangeStatus
better-authbetter-auth< 1.6.11affected

Weaknesses

  • CWE-287: CWE-287: Improper Authentication
  • CWE-345: CWE-345: Insufficient Verification of Data Authenticity
  • CWE-441: CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')
  • CWE-862: CWE-862: Missing Authorization

References