CVE-2025-71402

The CVE affects better-auth versions >1.3.34 and

EUVD-2025-210584

better-auth versions greater than 1.3.34 and before 1.4.0 contain a vulnerability in the multi-session plugin's /sign-out after-hook, which trusts raw multi-session cookies and forwards extracted values to internalAdapter.deleteSessions without verifying the cookie signature e.g., via...

GHSA-WMJR-V86C-M9JJ Better Auth's multi-session sign-out hook allows forged cookies to revoke arbitrary sessions

Summary A vulnerability was identified in the multi-session plugin for Better Auth, specifically in the /sign-out after-hook. The hook trusts raw multi-session cookies and forwards the extracted values directly to internalAdapter.deleteSessions without verifying the cookie signature. Because cook...