CVE-2026-67335
Published:August 01, 2026
Updated:August 04, 2026
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.
Affected Packages
https://github.com/better-auth/better-auth.git (GITHUB):
Affected version(s) >=v0.0.2-beta.1 <v1.6.2Fix Suggestion:
Update to version v1.6.2better-auth (NPM):
Affected version(s) >=0.0.1 <1.6.2Fix Suggestion:
Update to version 1.6.2Related Resources (8)
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Contact UsCVSS v4
Base Score:
6
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
EPSS
Base Score:
0.17