CVE-2025-71402Network attack vectorHinoki check available

Authenticated session revocation via forged cookie

Published Aug 1, 2026 · Updated Aug 1, 2026

Session revocation in Better Auth after 1.3.34 and before 1.4.0 allows remote authenticated users to delete arbitrary session tokens. The multi-session /sign-out after-hook passes values from unsigned _multi-* cookies directly to internalAdapter.deleteSessions instead of verifying their signatures. Exploitation requires the multi-session plugin, high privileges, and passive user interaction; successful requests forcibly revoke selected sessions.

CVSS severity2.0
Low
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Session revocation in Better Auth after 1.3.34 and before 1.4.0 allows remote authenticated users to delete arbitrary session tokens. The multi-session /sign-out after-hook passes values from unsigned _multi-* cookies directly to internalAdapter.deleteSessions instead of verifying their signatures. Exploitation requires the multi-session plugin, high privileges, and passive user interaction; successful requests forcibly revoke selected sessions.

The record

CVE
CVE-2025-71402
Published
Aug 1, 2026
Updated
Aug 1, 2026
Vendor
Better Auth
Product
Better Auth
Classifications
CWE-347, T1531
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Better Auth · Better Authversion=0 <1.4.0

Published CVSS scores

2.0GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-347Improper Verification of Cryptographic Signature
T1531Account Access Removal

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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