CVE-2026-67335CWE-287

CVE-2026-67335

Medium · published August 1, 2026

CVSS v3.1
5.3
EPSS
0%
Percentile
19.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
5.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00283 · 19.7th percentile
Weakness
CWE-287 · Improper Authentication
Published
2026-08-01T17:17Z
References (2)
https://github.com/better-auth/better-auth/security/advisories/GHSA-wxw3-q3m9-c3jr · [email protected]https://www.vulncheck.com/advisories/better-auth-before-oauth-state-validation-bypass · [email protected]
EPSS history
Timeline
  • 01 AUG 12:22Z
    better-auth before 1.6.2 OAuth State Validation Bypass
    cvelistv5