Live › vulnerability › CVE-2026-114617
Go to dashboardAuthlib's OpenID Connect parser lets a token disable its own nonce check by setting nonce_supported to false. An attacker holding a validly signed ID token can replay it into their own session in implicit and hybrid flows.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Applications that use Authlib's OpenIDMixin.parse_id_token() with implicit or hybrid OpenID Connect relying parties, or that directly accept ID tokens supplied from outside. Plain authorization code flow is not affected, and the token must still pass signature, issuer and audience checks.
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pip show authlib and check the installed version is below 1.9.0authlib to find pinned versions1.9.0 or laterEach row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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