Disclosure summary
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-reported weakness categories
CWE-347
Source-specific records & product guidance
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NIST NVD · NVD-CVE-2025-71402
Open original source · Updated Oct 06, 2026
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Original records & references
Repositories cited by this CVE
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- better-auth/better-auth CVE record citation
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Discovery progress
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PUBLISHED 2026-08-01T13:16:55+00:00
MODIFIED 2026-10-06T22:10:00+00:00
INGESTED 2026-10-11T00:25:11+00:00