CVE-2025-71402 | BDVDB-2026-354489 Detail

Description#

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 getSignedCookie). An attacker can supply a forged _multi-* cookie to trigger deletion of arbitrary session tokens.

Impact#

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Exploit#

History#

1. Version 12026-08-01Record published in the CVE List.
2. Version 22026-08-03Most recent update recorded in the CVE List.