CVE-2025-71402better-auth before 1.4.0 Session Revocation via Forged Cookie
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 2.0 LOW (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N
- Weakness (CWE)
- CWE-347
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Aug 3, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
better-auth better-auth better_auth:better_auth (from the name) | before 1.4.0; 1.4.0 not affected | CNA record |
References
- https://github.com/better-auth/better-auth/security/advisories/GHSA-wmjr-v86c-m9jjvendor-advisory
- https://www.vulncheck.com/advisories/better-auth-before-session-revocation-via-forged-cookiethird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.