{"id":"CVE-2026-19607","title":"A flaw was found in the first-broker-login flow of the keycloak-services component","summary":"A flaw was found in the first-broker-login flow of the keycloak-services component. This component handles the initial authentication and account linking when a user logs in via an external identity provider. The issue allows an attacker…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-287"],"vendor":"Red Hat","product":"keycloak-rhel9-container","affected":["keycloak-rhel9-container (all versions)","keycloak-rhel9-operator-container (all versions)","rhbk/keycloak-operator-bundle (all versions)","keycloak-services","rhbk-openshift-rhel9/rhbk-openshift-rhel9","keycloak-rhel9-container (all versions)","keycloak-rhel9-operator-bundle-container (all versions)","keycloak-rhel9-operator-container (all versions)","keycloak-services","rhbk-openshift-rhel9/rhbk-openshift-rhel9","keycloak-services"],"patched":["build_of_keycloak 26.4","build_of_keycloak 26.4.16","build_of_keycloak 26.6.7"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:42:43.623","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-19607","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:68276","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:68277","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:68278","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:68280","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-19607","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2514529","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-19607.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-19607"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19607"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-16T18:25:13.980390Z"},"ingestedAt":"2026-09-16T15:58:38.767Z","epss":0.00507,"epssPercentile":0.42136,"slug":"CVE-2026-19607","body":"## Overview\n\nA flaw was found in the first-broker-login flow of the keycloak-services component. This component handles the initial authentication and account linking when a user logs in via an external identity provider. The issue allows an attacker to register a matching username on an external provider to trigger a collision in Keycloak, which results in the legitimate user being locked out of their account.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:68276** · Red Hat · fixed in: Red Hat build of Keycloak 26.4 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68276)\n- **RHSA-2026:68280** · Red Hat · fixed in: Red Hat build of Keycloak 26.4.16 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68280)\n- **RHSA-2026:68278** · Red Hat · fixed in: Red Hat build of Keycloak 26.6.7 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68278)\n- **RHSA-2026:68277** · Red Hat · fixed in: Red Hat build of Keycloak 26.6 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68277)","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}