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TI-2026-30067 Aliases CVE-2026-41479GHSA-w8p2-r796-3vmq

Authlib OAuth 2.0 authorization endpoint open redirects to attacker-controlled redirect_uri on unsupported response_type

Priority LOW 24CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
Partial Red Hat: 4 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-601.

Summary

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.10 and 1.7.1, Authlib's OAuth 2.0 authorization endpoint can be turned into an unauthenticated open redirect when a request uses an unsupported response_type and supplies an attacker-controlled redirect_uri. The vulnerable behavior happens before client lookup and before any redirect URI validation. As a result, an attacker does not need a valid client registration, an authenticated user, or any prior state. A single request to the authorization endpoint is enough to obtain a 302 Location response to an arbitrary attacker-controlled URL. This vulnerability is fixed in 1.6.10 and 1.7.1.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00257 17th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial authlib (authlib): 1.6.10authlib (PyPI): 1.6.10, 1.7.1Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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

VendorProductAffected versionsFixed inStatusSource
authlibauthlibbefore 1.6.10; = 1.7.01.6.10Patch availableCNA
—authlib (PyPI)before 1.6.101.6.10Patch availableGHSA-w8p2-r796-3vmq
—authlib (PyPI)1.7.0 to before 1.7.11.7.1Patch availableGHSA-w8p2-r796-3vmq
  • authlib Vendorauthlib Affected before 1.6.10; = 1.7.0 Fixed in 1.6.10 Patch available CNA
  • authlib (PyPI) Vendor— Affected before 1.6.10 Fixed in 1.6.10 Patch available GHSA-w8p2-r796-3vmq
  • authlib (PyPI) Vendor— Affected 1.7.0 to before 1.7.1 Fixed in 1.7.1 Patch available GHSA-w8p2-r796-3vmq

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*before 1.6.10Vulnerableauthlib
cpe:2.3:a:authlib:authlib:1.7.0:*:*:*:*:*:*:*1.7.0Vulnerableauthlib
  • cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:* Versions before 1.6.10 Vulnerable ·authlib
  • cpe:2.3:a:authlib:authlib:1.7.0:*:*:*:*:*:*:* Versions 1.7.0 Vulnerable ·authlib

Remediation

  • Fix · CNA authlib (authlib) Fixed in 1.6.10
  • Fix · GHSA-w8p2-r796-3vmq authlib (PyPI) Fixed in 1.6.10 Advisory →
  • Fix · GHSA-w8p2-r796-3vmq authlib (PyPI) Fixed in 1.7.1 Advisory →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Exploit IntelligenceAffectedNo fix yet: Fix deferred
Migration Toolkit for Applications 8AffectedNo fix yet: Fix deferred
Red Hat Ansible Automation Platform 2AffectedNo fix yet: Fix deferred
Red Hat Quay 3AffectedNo fix yet: Fix deferred
Not affected: 6 products
  • Lightspeed Core
  • OpenShift Lightspeed
  • Red Hat Enterprise Linux command line assistant
  • Red Hat Hardened Images
  • Red Hat OpenShift Virtualization 4
  • Red Hat Satellite 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-41479
  2. 2026-10-03 Alias added: GHSA-w8p2-r796-3vmq

References

Exploit 1

Patch 1

Advisory 1

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

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences