CSRF in Authlib
CVE-2025-68158
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.
Vulnerability class: CSRF (Cross-Site Request Forgery)
EPSS: 0.002 (14.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N.
Affected products
- Authlib — versions >= 1.0.0, < 1.6.6
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-68158?
- CVE-2025-68158 is a medium-severity vulnerability in Authlib, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.7/10. Published 2026-01-08.
- How severe is CVE-2025-68158?
- Medium severity. CVSS v3 base score is 5.7 out of 10.