CVE-2026-34454
OAuth2 Proxy is a reverse proxy that provides authentication using OAuth2 providers.
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/oauth2-proxy/oauth2-proxy/v7 | >= 7.11.0, < 7.15.2 | 7.15.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Oauth2 Proxy Project | Oauth2 Proxy | from 7.11.0 before 7.15.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-f24x-5g9q-753f
- https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-f24x-5g9q-753f
- https://github.com/oauth2-proxy/oauth2-proxy/pull/2605
- https://nvd.nist.gov/vuln/detail/CVE-2026-34454
- https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.15.2