{"cve":"CVE-2025-12390","nvd":{"published":"2025-10-28T14:15:57.980","modified":"2026-10-18T21:10:00.120","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","score":6.0},"cwes":["CWE-384"],"references":["https://access.redhat.com/errata/RHSA-2025:21370","https://access.redhat.com/errata/RHSA-2025:21371","https://access.redhat.com/errata/RHSA-2025:22088","https://access.redhat.com/errata/RHSA-2025:22089","https://access.redhat.com/security/cve/CVE-2025-12390"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:12:35.277909958+00:00"},"epss":{"cve":"CVE-2025-12390","score":0.00141,"percentile":0.03392,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-rg35-5v25-mqvp","url":"https://osv.dev/vulnerability/GHSA-rg35-5v25-mqvp","summary":"Keycloak vulnerable to session takeovers due to reuse of session identifiers","modified":"2026-09-10T03:50:58.286948756Z","packages":[{"ecosystem":"Maven","name":"org.keycloak:keycloak-services","purl":"pkg:maven/org.keycloak/keycloak-services","ranges":["<26.0.0"],"fixed":["26.0.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}