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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://github.com/authlib/authlib/commit/2808378611dd6fb2532b189a9087877d8f0c0489 Patch
- https://github.com/authlib/authlib/commit/7974f45e4d7492ab5f527577677f2770ce423228 Patch
- https://github.com/authlib/authlib/security/advisories/GHSA-fg6f-75jq-6523 Exploit, Vendor Advisory
- https://github.com/authlib/authlib/security/advisories/GHSA-fg6f-75jq-6523 Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.8 · authlibNVD modified 2026-10-14 17:10
Affected (CPE criteria) 1
cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*
References 4
- https://github.com/authlib/authlib/commit/2808378611dd6fb2532b189a9087877d8f0c0489 Patch
- https://github.com/authlib/authlib/commit/7974f45e4d7492ab5f527577677f2770ce423228 Patch
- https://github.com/authlib/authlib/security/advisories/GHSA-fg6f-75jq-6523 Exploit, Vendor Advisory
- https://github.com/authlib/authlib/security/advisories/GHSA-fg6f-75jq-6523 Exploit, Vendor Advisory