CVE-2026-67335
CVE-2026-67335 · better-auth before 1.6.2 OAuth State Validation Bypass
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.0 · Medium · EPSS 0.3% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
better-auth
- Versions
- ≥ 0, < 1.6.2: Affected (semver)
- 1.6.2: Not affected (semver)
Update to 1.6.2
better-auth npm
- Affected ranges
- SEMVER: < 1.6.2
Update to 1.6.2