{"id":"CVE-2026-19607","aliases":["EUVD-2026-80855","GHSA-h87q-rx56-87wm","UBUNTU-CVE-2026-19607"],"status":"published","title":"Keycloak-services: keycloak-services: broker-originated username collision causes account lockout","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.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00686,"percentile":0.5296,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-287"],"published":"2026-09-16T15:46:43Z","modified":"2026-10-17T12:59:54Z","exploits":[{"source":"pocgithub","id":"7Ragnarok7/CVE-2026-19607","title":"7Ragnarok7/CVE-2026-19607","date":"2026-08-08","url":"https://github.com/7Ragnarok7/CVE-2026-19607"}],"affected":[{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"python-keycloak","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.0+dfsg-2","3.9.0+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"python-keycloak","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.7.0+dfsg-1"]}],"products":[{"vendor":"red hat","product":"red hat build of keycloak 26.4"},{"vendor":"red hat","product":"red hat build of keycloak 26.4.16"},{"vendor":"red hat","product":"red hat build of keycloak 26.6"},{"vendor":"red hat","product":"red hat build of keycloak 26.6.7"},{"vendor":"red hat","product":"red hat single sign-on 7"}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:68276","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:68277","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:68278","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:68280","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-19607","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2514529","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-19607"},{"url":"https://github.com/advisories/GHSA-h87q-rx56-87wm"},{"url":"https://ubuntu.com/security/CVE-2026-19607","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-19607","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-19607","title":"Keycloak-services: keycloak-services: broker-originated username collision causes account lockout","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.","status":"published","published":"2026-09-16T15:46:43.043Z","modified":"2026-09-16T18:35:08.909Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T13:47:17.512524Z"}],"euvd":[{"id":"EUVD-2026-80855","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.","status":"published","published":"2026-09-16T15:46:43Z","modified":"2026-09-16T18:35:08Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T17:28:14.682482Z"}],"ghsa":[{"id":"GHSA-h87q-rx56-87wm","title":"A flaw was found in the first-broker-login flow of the keycloak-services component. This...","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.","status":"published","published":"2026-09-16T18:32:03Z","modified":"2026-09-16T18:32:09Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T15:12:00.76854Z"}],"nvd":[{"id":"CVE-2026-19607","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.","status":"published","published":"2026-09-16T16:17:06.607Z","modified":"2026-09-16T19:42:43.623Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:12:48.630594Z"}],"osv":[{"id":"UBUNTU-CVE-2026-19607","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.","status":"published","published":"2026-09-16T16:17:00Z","modified":"2026-10-17T12:59:54.663673046Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T16:56:01.334185Z"}]}}