CVE-2026-34454: OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. A regression introduced in 7.11.0 prevents OAuth2 Proxy from clearing the…

PriorityP413low3.5CVSS 3.1

AVPACLPRNUINSUCLILAN

EPSS

0.18%

8.0th percentile

OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers. A regression introduced in 7.11.0 prevents OAuth2 Proxy from clearing the session cookie when rendering the sign-in page. In deployments that rely on the sign-in page as part of their logout flow, a user may be shown the sign-in page while the existing session cookie remains valid, meaning the browser session is not actually logged out. On shared workstations or devices, a subsequent user could continue to use the previous user's authenticated session. Deployments that use a dedicated logout/sign-out endpoint to terminate sessions are not affected. This issue is fixed in 7.15.2

Affected

3 ranges

Vendor	Product	Version range	Fixed in
github.com	oauth2-proxy_oauth2-proxy_v7	>= 7.11.0 < 7.15.2	7.15.2
oauth2-proxy	oauth2-proxy	—	—
oauth2_proxy_project	oauth2_proxy	>= 7.11.0 < 7.15.2	7.15.2

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