{"id":"CVE-2025-12390","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-12390","generatedAt":"2026-10-28T03:42:17.791Z","title":"This happens because Keycloak sometimes reuses session identifiers and doesn’t clean up properly during logout when browser cookies are missing.","description":"A flaw was found in Keycloak. In Keycloak where a user can accidentally get access to another user's session if both use the same device and browser. This happens because Keycloak sometimes reuses session identifiers and doesn’t clean up properly during logout when browser cookies are missing. As a result, one user may receive tokens that belong to another user.","published":"2025-10-28T14:15:58.000Z","lastModified":"2026-10-18T21:10:00.000Z","status":"Deferred","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":6,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N"},"cwe":["CWE-384"],"affected":[],"epss":{"score":0.00141,"percentile":0.03399,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.14%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2025:21370","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:21371","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:22088","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:22089","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2025-12390","source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2406793","source":"secalert@redhat.com"},{"url":"https://github.com/keycloak/keycloak/issues/43853","source":"secalert@redhat.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-12390","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}