CVE-2025-68158: Authlib

High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days.

Authlib is a Python library which builds OAuth and OpenID Connect servers. In versions 1.0.0 through 1.6.5, cache-backed state/request-token storage is not tied to the initiating user session, so CSRF is possible for any attacker that has a valid state (easily obtainable via an attacker-initiated authentication flow). When a cache is supplied to the OAuth client registry, FrameworkIntegration.set_state_data writes the entire state blob under _state_{app}_{state}, and get_state_data ignores the caller’s session altogether. This issue has been patched in version 1.6.6.

Affected products

• Authlib Authlib: before 1.6.6 (fixed in 1.6.6)

Published 2026-01-08. Last modified 2026-06-17.