VULNERABILITY INTELLIGENCE
CVE-2025-71402
CVSS score2 LOW
EPSS probability0.27%
CISA KEVNot currently listed
Published2026-08-01
Last modified2026-10-06
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N
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.
Weakness classification
- CWE-347: Improper Verification of Cryptographic Signature