6.8
Medium
CVE-2026-40574 OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers
Description
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 with an email claim such as attacker@evil.com@company.com and satisfy an allowed domain check for company.com, even though the claim is not a valid email address. The issue ONLY affects deployments that rely on email_domain restrictions and accept email claim values from identity providers or claim mappings that do not strictly enforce normal email syntax. This vulnerability is fixed in 7.15.2.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| oauth2-proxy 7.15 | earliest → < 7.15.2 | 7.15.2 |
Other CVEs of oauth2-proxy
The 10 CVEs of oauth2-proxy →
CVE-2026-76835
OAuth2 Proxy honours a client-supplied X-Forwarded-Uri header when deciding whether a request may skip authentication,…
9.3
Critical
CVE-2026-40575
OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers
9.1
Critical
CVE-2026-41059
OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers
8.2
High
CVE-2026-34457
OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers
9.1
Critical