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Authlib CVE-2026-41425

| EUVDEUVD-2026-25615 MEDIUM
Cross-Site Request Forgery (CSRF) (CWE-352)
2026-04-24 GitHub_M
CSRF Python Suse Red Hat
5.4
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
5.4 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
SUSE
MEDIUM
qualitative
Red Hat
5.4 MEDIUM
qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

6
Patch released
Apr 28, 2026 - 18:18 nvd
Patch available
Patch available
Apr 24, 2026 - 21:02 EUVD
Analysis Generated
Apr 24, 2026 - 20:16 vuln.today
EUVD ID Assigned
Apr 24, 2026 - 19:45 euvd
EUVD-2026-25615
Analysis Generated
Apr 24, 2026 - 19:45 vuln.today
CVE Published
Apr 24, 2026 - 19:14 nvd
MEDIUM 5.4

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 3 pypi packages depend on authlib (3 direct, 0 indirect)

Ecosystem-wide dependent count for version 1.6.11.

DescriptionGitHub Advisory

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.6.11, there is no CSRF protection on the cache feature in authlib.integrations.starlette_client.OAuth. This vulnerability is fixed in 1.6.11.

AnalysisAI

Cross-site request forgery (CSRF) in Authlib's Starlette OAuth client cache feature (versions prior to 1.6.11) allows unauthenticated remote attackers to forge requests that manipulate cached OAuth state, potentially leading to session hijacking or token theft. The vulnerability requires user interaction (UI:R) and affects confidentiality and integrity. Vendor-released patch: version 1.6.11.

Technical ContextAI

Authlib is a Python library implementing OAuth 2.0 and OpenID Connect server/client functionality. The vulnerability resides in the authlib.integrations.starlette_client.OAuth module, specifically in cache handling mechanisms used during the OAuth authorization flow. The root cause is CWE-352 (Cross-Site Request Forgery), indicating missing or insufficient CSRF token validation on state-cache operations in the Starlette integration. This affects the confidentiality and integrity of OAuth session management in web applications using this integration.

RemediationAI

Upgrade Authlib to version 1.6.11 or later immediately. For Python environments using pip, execute: pip install --upgrade authlib>=1.6.11. Verify the installed version with pip show authlib. If immediate upgrade is not feasible, configure Starlette middleware to enforce SameSite=Strict cookies and implement explicit CSRF token validation on all OAuth callback handlers using Starlette's built-in CSRF middleware until patching is complete. This reduces but does not eliminate risk. Review GitHub Security Advisory GHSA-jj8c-mmj3-mmgv (https://github.com/authlib/authlib/security/advisories/GHSA-jj8c-mmj3-mmgv) for additional context and confirmation of fix.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Python 3 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP7 Fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed

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CVE-2026-41425 vulnerability details – vuln.today
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