{"id":"CVE-2026-34454","aliases":["BIT-oauth2-proxy-2026-34454","GHSA-f24x-5g9q-753f","GO-2026-5341"],"url":"https://o3.security/vulnerability/CVE-2026-34454","summary":"OAuth2 Proxy: Session cookie not cleared when rendering sign-in page","details":"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","published":"2026-04-14T22:10:37.901Z","modified":"2026-08-05T03:47:28.628448306Z","cvss":{"score":3.5,"severity":"LOW","vector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/oauth2-proxy/oauth2-proxy/v7","fixedVersion":"7.15.2"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.15.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34454.json"},{"type":"ADVISORY","url":"https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-f24x-5g9q-753f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34454"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:47:28.628448306Z"}}