What is CVE-2026-41425?

CVE-2026-41425 is a medium-severity vulnerability in Authlib, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2026-04-24.

How severe is CVE-2026-41425?

Medium severity. CVSS v3 base score is 5.4 out of 10.

CSRF in Authlib

CVE-2026-41425

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.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2026-04-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.001 (2.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Authlib — versions < 1.6.11

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

github.com/authlib/authlib/security/advisories/GHSA-jj8c-mmj3-mmgv (Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-41425?: CVE-2026-41425 is a medium-severity vulnerability in Authlib, classified under Cross-Site Request Forgery (CSRF). CVSS score: 5.4/10. Published 2026-04-24.
How severe is CVE-2026-41425?: Medium severity. CVSS v3 base score is 5.4 out of 10.