CVE-2025-71402— better-auth before 1.4.0 Session Revocation via Forged Cookie
Quick assessment
Affected
better-auth better-auth
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
better-auth是better-auth团队开源的一个身份验证框架。 better-auth 1.3.34之后版本和1.4.0之前版本存在加密问题漏洞，该漏洞源于multi-session插件的/sign-out after-hook信任原始multi-session cookie，未验证cookie签名即将提取值转发给internalAdapter.deleteSessions，攻击者可提供伪造的_multi-* cookie触发删除任意会话令牌。
Possible ATT&CK Techniques 1 AI
T1136.003 · Cloud AccountAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| better-auth | better-auth | < 1.4.0 |
affected |
1.4.0 |
unaffected |
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I. Basic Information for CVE-2025-71402
Vulnerability Information
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Vulnerability Title
better-auth before 1.4.0 Session Revocation via Forged Cookie
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
better-auth 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
better-auth是better-auth团队开源的一个身份验证框架。 better-auth 1.3.34之后版本和1.4.0之前版本存在加密问题漏洞，该漏洞源于multi-session插件的/sign-out after-hook信任原始multi-session cookie，未验证cookie签名即将提取值转发给internalAdapter.deleteSessions，攻击者可提供伪造的_multi-* cookie触发删除任意会话令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| better-auth | better-auth | 0 ~ 1.4.0 | - |
|
II. Public POCs for CVE-2025-71402
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2025-71402 (2)
Same Patch Batch · better-auth · 2026-08-01 · 14 CVEs total
| CVE-2026-67330 | 9.9 CRITICAL | better-auth SCIM 1.4.0-beta.27 through 1.6.21 Account Takeover via Provider-ID Collision |
| CVE-2026-67336 | 8.7 HIGH | better-auth before 1.6.11 Insecure Cryptographic Defaults via oidcProvider |
| CVE-2026-67327 | 8.3 HIGH | better-auth before 1.6.22 Account Takeover via Magic-Link Email-OTP |
| CVE-2026-67331 | 8.3 HIGH | better-auth SCIM 1.5.0 before 1.7.0-beta.4 Authorization Bypass |
| CVE-2026-67328 | 8.1 HIGH | @better-auth/sso before 1.6.21 Account Takeover via SSO |
| CVE-2026-67333 | 7.2 HIGH | better-auth before 1.6.13 Stored XSS via javascript redirect_uri |
| CVE-2026-67329 | 7.1 HIGH | @better-auth/stripe before 1.6.21 Authorization Bypass via Organization Subscription |
| CVE-2025-71403 | 7.1 HIGH | better-auth before 1.1.20 Open Redirect via trustedOrigins Bypass |
| CVE-2026-67337 | 6.5 MEDIUM | better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache |
| CVE-2026-67332 | 6.4 MEDIUM | @better-auth/oauth-provider before 1.7.0-beta.4 Authorization Bypass |
| CVE-2026-67335 | 5.3 MEDIUM | better-auth before 1.6.2 OAuth State Validation Bypass |
| CVE-2025-71404 | 5.1 MEDIUM | better-auth before 1.1.16 Reflected XSS via error parameter |
| CVE-2026-67334 | 3.8 LOW | better-auth Stale Sessions Persist After User Deletion |
IV. Related Vulnerabilities
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CVE-2025-71401
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better-auth before 1.6.22 Account Takeover via Magic-Link Em -
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better-auth before 1.6.13 Stored XSS via javascript redirect
Same vendor: better-auth
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Same weakness: CWE-347
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