CVE-2026-114617
Medium · CVSS 4.2Published 2026-10-22
CVSS
4.2
Medium
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-114617?
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, OpenIDMixin.parse_id_token() reads the nonce_supported decision from the untrusted ID token being validated and sets the expected nonce to null when that claim is the JSON boolean false. In implicit and hybrid relying parties, or applications that directly accept externally supplied ID tokens, an attacker with a captured validly signed token can bypass the nonce-to-session binding and replay the victim's token into an attacker-controlled session. Plain authorization code flow is not affected, and the token must still pass signature, issuer, and audience validation. OpenIDMixin.parse_id_token() trusts nonce_supported in both authlib/integrations/base_client/sync_openid.py and authlib/integrations/base_client/async_openid.py to disable the expected nonce. This issue is fixed in version 1.9.0.
CVSS Score Explained
CVSS 4.2 is Medium severity. Exploitation usually requires some specific conditions (local access, user interaction, or a particular config). Still worth patching in your next maintenance window.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›https://github.com/authlib/authlib/commit/6563f6f7a8c2f71d2f85ee7511d72a4fbae3acc0
- ›https://github.com/authlib/authlib/pull/949
- PATCHhttps://github.com/authlib/authlib/releases/tag/v1.9.0
- ›https://github.com/authlib/authlib/security/advisories/GHSA-c5mf-xmp2-59rc
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