Vulnerability 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.
Related Weaknesses (CWE)
References
- https://github.com/better-auth/better-auth/security/advisories/GHSA-wmjr-v86c-m9
- https://www.vulncheck.com/advisories/better-auth-before-session-revocation-via-f
FAQ
What is CVE-2025-71402?
CVE-2025-71402 is a documented vulnerability. 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 valu...
How severe is CVE-2025-71402?
CVSS scoring is not yet available for CVE-2025-71402. Check NVD for updates.
Is there a patch for CVE-2025-71402?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.