CVE-2026-41425: Authlib: Cross-site request forging when using cache

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-24 · updated 2026-06-17
Weakness: CWE-352

Description

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.

Affected products

authlib: before 1.6.11 — fixed in 1.6.11

How to fix

Upgrade to a fixed version: authlib 1.6.11. Check the vendor advisory for mitigations.

References

https://github.com/authlib/authlib/security/advisories/GHSA-jj8c-mmj3-mmgv
https://github.com/authlib/authlib/security/advisories/GHSA-jj8c-mmj3-mmgv

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