TI-2026-79522 Aliases CVE-2026-114619 GHSA-q686-2qmg-hqc7

Authlib OpenID implicit grant issues ID tokens without openid scope

MEDIUM 54CWE-863Published 2026-10-22 · Updated 2026-10-29

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: Low · Low · None
Fix status: Partial Red Hat: 9 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-863.

Summary

Authlib before 1.9.0 checks the raw client-supplied scope instead of the filtered allowed scope in its OpenID implicit grant (CWE-863). A registered client that may request an ID token but not the openid scope can add openid, obtain user consent, and receive a signed ID token containing the user's subject and allowed profile claims. A public exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00162 5th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial authlib (authlib): 1.9.0authlib (PyPI): 1.9.0Red Hat: 9 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
authlib	authlib	before 1.9.0	1.9.0	Patch available	CNA
—	authlib (PyPI)	before 1.9.0	1.9.0	Patch available	GHSA-q686-2qmg-hqc7

authlib Vendorauthlib Affected before 1.9.0 Fixed in 1.9.0 Patch available CNA
authlib (PyPI) Vendor— Affected before 1.9.0 Fixed in 1.9.0 Patch available GHSA-q686-2qmg-hqc7

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:authlib:authlib::::::::	before 1.9.0	Vulnerable	authlib

cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:* Versions before 1.9.0 Vulnerable ·authlib

Remediation

Upgrade the authlib package on PyPI to version 1.9.0. The sources list no fixed version for Lightspeed Core, Migration Toolkit for Applications 8, OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux command line assistant, Red Hat OpenShift Virtualization 4 and Red Hat Satellite 6 (none available), and for Exploit Intelligence and Red Hat Quay 3 (no fix planned).

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA authlib (authlib) Fixed in 1.9.0
Fix · GHSA-q686-2qmg-hqc7 authlib (PyPI) Fixed in 1.9.0 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Exploit Intelligence	Affected	No fix planned: Out of support scope
Lightspeed Core	Affected	No fix yet: Fix deferred
Migration Toolkit for Applications 8	Affected	No fix yet: Fix deferred
OpenShift Lightspeed	Affected	No fix yet: Fix deferred
Red Hat Ansible Automation Platform 2	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux command line assistant	Affected	No fix yet: Fix deferred
Red Hat OpenShift Virtualization 4	Affected	No fix yet: Fix deferred
Red Hat Quay 3	Affected	No fix planned: Out of support scope
Red Hat Satellite 6	Affected	No fix yet: Fix deferred

Timeline

2026-10-23 Threatist record created from CVE-2026-114619
2026-10-23 Affected versions changed · Red Hat
2026-10-23 CVSS score added · Red Hat
2026-10-27 Alias added: GHSA-q686-2qmg-hqc7
2026-10-29 CISA SSVC decision points changed
2026-10-29 Priority changed: LOW → MEDIUM

References

Exploit 1

https://github.com/authlib/authlib/security/advisories/GHSA-q686-2qmg-hqc7

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-114619

Other 2

TI-2026-22305 Authlib JWS JWK Header Injection: Signature Verification Bypass CVSS 3.1CRITICAL 9.1
TI-2026-79518 Authlib fix bypass lets attackers forge HS256 tokens with PEM keys CVSS 3.1CRITICAL 9.1
TI-2025-36973 Authlib: JWS/JWT accepts unknown crit headers (RFC violation → possible authz bypass) CVSS 3.1HIGH 7.5
TI-2024-25068 lepture Authlib before 1.3.1 has algorithm confusion with asymmetric public keys. CVSS 3.1HIGH 7.5
TI-2025-41738 Authlib: 1-click Account Takeover CVSS 3.1HIGH 8.8
TI-2026-22761 Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding CVSS 4.0HIGH 8.2

See all 18 →

Sources

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