{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-34454","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-03-27T18:18:14.895Z","datePublished":"2026-04-14T22:10:37.901Z","dateUpdated":"2026-04-15T13:30:10.300Z"},"containers":{"cna":{"title":"OAuth2 Proxy: Session cookie not cleared when rendering sign-in page","problemTypes":[{"descriptions":[{"cweId":"CWE-613","lang":"en","description":"CWE-613: Insufficient Session Expiration","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-384","lang":"en","description":"CWE-384: Session Fixation","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"PHYSICAL","availabilityImpact":"NONE","baseScore":3.5,"baseSeverity":"LOW","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-f24x-5g9q-753f","tags":["x_refsource_CONFIRM"],"url":"https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-f24x-5g9q-753f"},{"name":"https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.15.2","tags":["x_refsource_MISC"],"url":"https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.15.2"}],"affected":[{"vendor":"oauth2-proxy","product":"oauth2-proxy","versions":[{"version":">= 7.11.0, < 7.15.2","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-04-14T22:14:00.972Z"},"descriptions":[{"lang":"en","value":"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"}],"source":{"advisory":"GHSA-f24x-5g9q-753f","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-15T13:30:00.521921Z","id":"CVE-2026-34454","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-04-15T13:30:10.300Z"}}]}}