CVE-2025-71402 — better-auth before 1.4.0 Session Revocation via Forged Cookie
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 …
Published: 2026-08-01 · CVSS: 2.0 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7