CVE-2026-67335— better-auth before 1.6.2 OAuth State Validation Bypass
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 1.6.2之前版本存在授权问题漏洞，该漏洞源于在使用基于cookie的状态存储且未使用PKCE时，未验证OAuth state参数与存储的nonce，可能导致攻击者伪造state参数并提供攻击者控制的授权码，创建绑定到攻击者外部身份的身份验证会话，或将攻击者账户持久链接到受害者配置文件。
Possible ATT&CK Techniques 1 AI
T1199 · Trusted RelationshipAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| better-auth | better-auth | < 1.6.2 |
affected |
1.6.2 |
unaffected |
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I. Basic Information for CVE-2026-67335
Vulnerability Information
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Vulnerability Title
better-auth before 1.6.2 OAuth State Validation Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
better-auth versions before 1.6.2 fail to validate the OAuth state parameter against the stored nonce when using cookie-backed state storage without PKCE. Attackers can forge the state parameter and supply an attacker-controlled authorization code to create authenticated sessions bound to the attacker's external identity or persistently link attacker accounts to victim profiles.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
better-auth 授权问题漏洞
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 1.6.2之前版本存在授权问题漏洞，该漏洞源于在使用基于cookie的状态存储且未使用PKCE时，未验证OAuth state参数与存储的nonce，可能导致攻击者伪造state参数并提供攻击者控制的授权码，创建绑定到攻击者外部身份的身份验证会话，或将攻击者账户持久链接到受害者配置文件。
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 ~ 1.6.2 | - |
|
II. Public POCs for CVE-2026-67335
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-67335 (2)
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-
🔗 better-auth before 1.6.2 OAuth State Validation Bypass | Advisories | VulnCheck third-party-advisory
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-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 |
| CVE-2025-71402 | 2.0 LOW | better-auth before 1.4.0 Session Revocation via Forged Cookie |
IV. Related Vulnerabilities
Same product: better-auth
-
CVE-2025-71401
better-auth before 1.4.2 basePath Modification DoS -
CVE-2025-71399
Better Auth before 1.4.5 Path Normalization Bypass via rou3 -
CVE-2026-67337
better-auth before 1.4.9 Two-Factor Authentication Bypass vi -
CVE-2026-67327
better-auth before 1.6.22 Account Takeover via Magic-Link Em -
CVE-2026-67333
better-auth before 1.6.13 Stored XSS via javascript redirect
Same vendor: better-auth
-
CVE-2026-80192
better-auth SSO before 1.6.27 Domain Ownership Authenticatio -
CVE-2025-71401
better-auth before 1.4.2 basePath Modification DoS -
CVE-2025-71400
better-auth passkey before 1.4.0 IDOR via delete-passkey -
CVE-2025-71399
Better Auth before 1.4.5 Path Normalization Bypass via rou3 -
CVE-2026-67327
better-auth before 1.6.22 Account Takeover via Magic-Link Em
Same weakness: CWE-287
-
CVE-2026-105213
ZITADEL before 4.17.1 Authentication Bypass via Login V2 for -
CVE-2026-105212
ZITADEL before 3.4.14 and 4.16.2 Account Takeover via Passke -
CVE-2026-105210
ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Log -
CVE-2026-105133
Ahsay AhsayCBS API ApiStructsAction.java checkSysPwd imprope -
CVE-2026-97343
Burst Statistics <= 3.7.1 - Improper Authentication to Accou
V. Comments for CVE-2026-67335
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