CVE-2026-34454
OAuth2 Proxy: Session cookie not cleared when rendering sign-in page
Description
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
How to fix CVE-2026-34454
To remediate CVE-2026-34454, upgrade the affected package to a fixed version below.
- —upgrade to 7.15.2 or later
- —upgrade to 7.15.2 or later
Is CVE-2026-34454 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 7.11.0, < 7.15.2
- >= 7.11.0, < 7.15.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.5 | CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |