{"id":"CVE-2026-19607","published":"2026-09-16T16:17:06.607","lastModified":"2026-09-16T19:42:43.623","description":"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 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.","cvssScore":5.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwes":["CWE-287"],"vendors":[],"products":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:68276","tags":[]},{"url":"https://access.redhat.com/errata/RHSA-2026:68277","tags":[]},{"url":"https://access.redhat.com/errata/RHSA-2026:68278","tags":[]},{"url":"https://access.redhat.com/errata/RHSA-2026:68280","tags":[]},{"url":"https://access.redhat.com/security/cve/CVE-2026-19607","tags":[]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2514529","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}