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: 0.002 (11.0th 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
- Oauth2_proxy_project Oauth2_proxy
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
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.