Medium 4.6Published Oct 22, 2026

CVE-2026-114619Authlib: OpenID implicit grant checks raw scope instead of allowed scope before issuing ID tokens

Updated under an hour ago (Oct 28, 2026, 6:50 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for authlib

Exploited in the last 30 days

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, OpenIDImplicitGrant.validate_authorization_request() checks the client-controlled raw request.payload.scope for openid after the parent grant has filtered allowed scopes into request.scope. A registered client permitted an ID token response type but not the openid scope can add openid to the request, obtain user consent, and receive a signed ID token containing the user's subject and allowed profile claims. Authorization code flow and deployments that allow openid for every client permitted an ID token response are not affected. In authlib/oidc/core/grants/implicit.py, OpenIDImplicitGrant.validate_authorization_request() checks request.payload.scope instead of the filtered request.scope. This issue is fixed in version 1.9.0.

CVSS: 4.6 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Weakness (CWE): CWE-863
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Awaiting Analysis
Record last updated: Oct 22, 2026
First seen by InfoSec Signals: Oct 22, 2026

Affected products

Affected products

authlib authlib authlib:authlib (from the name)	before 1.9.0	CNA record

References

References

https://github.com/authlib/authlib/security/advisories/GHSA-q686-2qmg-hqc7	x-refsource-confirm
https://github.com/authlib/authlib/pull/945	x-refsource-misc
https://github.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884baeedf	x-refsource-misc
https://github.com/authlib/authlib/releases/tag/v1.9.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.