Session Fixation Affecting oauth2-proxy-advanced-compat package, versions <7.15.2-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-OAUTH2PROXYADVANCEDCOMPAT-16087072
- published16 Apr 2026
- disclosed14 Apr 2026
Introduced: 14 Apr 2026
CVE-2026-34454 (opens in a new tab)How to fix?
Upgrade Minimos:latest oauth2-proxy-advanced-compat to version 7.15.2-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream oauth2-proxy-advanced-compat package and not the oauth2-proxy-advanced-compat package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
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
References
- https://www.cve.org/CVERecord?id=CVE-2026-34454
- https://github.com/advisories/GHSA-f24x-5g9q-753f
- https://osv.dev/vulnerability/MINI-wcv9-4mcj-w659
- https://osv.dev/vulnerability/CVE-2026-34454
- https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.15.2
- https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-f24x-5g9q-753f