{"id":"CVE-2026-9087","title":"A flaw was found in Keycloak","summary":"A flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId,\nidpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume i…","severity":"medium","cvss":6.4,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N","cwe":["CWE-639"],"published":"2026-05-20","updated":"2026-06-26","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-9087","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:25097","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:25098","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:30049","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:30050","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-9087","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2480172","label":"secalert@redhat.com"}],"tags":["nvd"],"epss":0.00312,"epssPercentile":0.24253,"ingestedAt":"2026-06-26T16:43:14.181Z","slug":"CVE-2026-9087","body":"## Overview\n\nA flaw was found in Keycloak. The cross-session verification proof is keyed only by (local userId,\nidpAlias) and is not bound to the upstream identity that was actually verified, so a second upstream account on the same IdP can consume it and get linked to the victim's local account.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":35,"depthScoreParts":{"impact":35.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}