What is CVE-2026-40574?

CVE-2026-40574 is a medium-severity vulnerability in Oauth2-proxy, classified under Incorrect Authorization. CVSS score: 6.8/10. Published 2026-04-21.

How severe is CVE-2026-40574?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Auth bypass in Oauth2-proxy

CVE-2026-40574

OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Prior to 7.15.2, an authorization bypass exists in OAuth2 Proxy as part of the email_domain enforcement option. An attacker may be able to authenticate wi…

Vulnerability class: Broken Access Control

EPSS: 0.001 (17.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.

Affected products

Oauth2-proxy — versions < 7.15.2

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-c5c4-8r6x-56w3 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-40574?: CVE-2026-40574 is a medium-severity vulnerability in Oauth2-proxy, classified under Incorrect Authorization. CVSS score: 6.8/10. Published 2026-04-21.
How severe is CVE-2026-40574?: Medium severity. CVSS v3 base score is 6.8 out of 10.