Authlib: Open Redirect in Authlib OIDC Implicit/Hybrid Authorization
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Spoofing, Security bypass
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-601 and CWE-863.
Summary
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.12 and 1.7.1, an unauthenticated open redirect in Authlib's OpenIDImplicitGrant and OpenIDHybridGrant authorization endpoint lets a remote attacker cause the authorization server to issue an HTTP 302 to an attacker-chosen URL by submitting an authorization request that omits the openid scope. This vulnerability is fixed in 1.6.12 and 1.7.1.
Why it matters now
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 1.6.12; 1.7.0 to before 1.7.1 | 1.6.12, 1.7.1 | Patch available | CNA |
| — | authlib (PyPI) | 1.7.0 to before 1.7.1 | 1.7.1 | Patch available | GHSA-r95x-qfjj-fjj2 |
| — | authlib (PyPI) | before 1.6.12 | 1.6.12 | Patch available | GHSA-r95x-qfjj-fjj2 |
- authlib Vendorauthlib Affected before 1.6.12; 1.7.0 to before 1.7.1 Fixed in 1.6.12, 1.7.1 Patch available CNA
- authlib (PyPI) Vendor— Affected 1.7.0 to before 1.7.1 Fixed in 1.7.1 Patch available GHSA-r95x-qfjj-fjj2
- authlib (PyPI) Vendor— Affected before 1.6.12 Fixed in 1.6.12 Patch available GHSA-r95x-qfjj-fjj2
Remediation
- Fix · CNA authlib (authlib) Fixed in 1.6.12, 1.7.1
- Fix · GHSA-r95x-qfjj-fjj2 authlib (PyPI) Fixed in 1.7.1 Advisory →
- Fix · GHSA-r95x-qfjj-fjj2 authlib (PyPI) Fixed in 1.6.12 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 |
| Migration Toolkit for Applications 8 | Affected | No fix yet: Fix deferred |
| Red Hat Quay 3 | Affected | No fix planned: Out of support scope |
Not affected: 6 products
- Lightspeed Core
- OpenShift Lightspeed
- Red Hat Ansible Automation Platform 2
- Red Hat Enterprise Linux command line assistant
- Red Hat OpenShift Virtualization 4
- Red Hat Satellite 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-44681
- 2026-10-03 Alias added: GHSA-r95x-qfjj-fjj2
- 2026-10-24 Affected versions changed · Red Hat
- 2026-10-24 CVSS score added · Red Hat
References
More Authlib vulnerabilities
- 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
Sources
- CVE-2026-44681 · CVE Program
- CVE-2026-44681 · NVD
- FIRST EPSS
- GHSA-r95x-qfjj-fjj2 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-44681 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences