CVE-2026-34457: OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions prior to 7.15.2 contain a configuration-dependent authentication…

PriorityP270critical9.1CVSS 3.1

AVNACLPRNUINSUCHIHAN

EPSS

0.47%

37.5th percentile

OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. Versions prior to 7.15.2 contain a configuration-dependent authentication bypass in deployments where OAuth2 Proxy is used with an auth_request-style integration (such as nginx auth_request) and either --ping-user-agent is set or --gcp-healthchecks is enabled. In affected configurations, OAuth2 Proxy treats any request with the configured health check User-Agent value as a successful health check regardless of the requested path, allowing an unauthenticated remote attacker to bypass authentication and access protected upstream resources. Deployments that do not use auth_request-style subrequests or that do not enable --ping-user-agent/--gcp-healthchecks are not affected. This issue is fixed in 7.15.2.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
github.com	oauth2-proxy_oauth2-proxy	0 – 3.2.0	—
github.com	oauth2-proxy_oauth2-proxy_v7	>= 0 < 7.15.2	7.15.2
oauth2-proxy	oauth2-proxy	< 7.15.2	7.15.2
oauth2_proxy_project	oauth2_proxy	< 7.15.2	7.15.2

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