CVE-2025-71402CWE-347

CVE-2025-71402

published August 1, 2026

CVSS
2.0
EPSS
0%
Percentile
17.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
2.0 · NONE
CVSS v4.0
Not supplied
EPSS
0.00268 · 17.9th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-08-01T17:16Z
References (2)
https://github.com/better-auth/better-auth/security/advisories/GHSA-wmjr-v86c-m9jj · [email protected]https://www.vulncheck.com/advisories/better-auth-before-session-revocation-via-forged-cookie · [email protected]
EPSS history
Timeline
  • 01 AUG 12:22Z
    better-auth before 1.4.0 Session Revocation via Forged Cookie
    cvelistv5