A flaw was found in Keycloak. An attacker can exploit this vulnerability by modifying the organization ID and target email within a legitimate invitation token's JSON Web Token (JWT) payload. This lack of cryptographic signature verification allows the attacker to successfully self-register into an unauthorized organization, leading to unauthorized access.
History

Tue, 10 Feb 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Redhat build Of Keycloak
Vendors & Products Redhat build Of Keycloak

Tue, 10 Feb 2026 01:45:00 +0000


Tue, 10 Feb 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Mon, 09 Feb 2026 21:15:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:build_keycloak: cpe:/a:redhat:build_keycloak:26.2::el9
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 09 Feb 2026 19:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in Keycloak. An attacker can exploit this vulnerability by modifying the organization ID and target email within a legitimate invitation token's JSON Web Token (JWT) payload. This lack of cryptographic signature verification allows the attacker to successfully self-register into an unauthorized organization, leading to unauthorized access.
Title Org.keycloak.services.resources.organizations: keycloak: unauthorized organization registration via improper invitation token validation
First Time appeared Redhat
Redhat build Keycloak
Weaknesses CWE-347
CPEs cpe:/a:redhat:build_keycloak:
Vendors & Products Redhat
Redhat build Keycloak
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-02-09T18:36:15.077Z

Updated: 2026-02-10T12:40:29.813Z

Reserved: 2026-01-28T12:22:02.063Z

Link: CVE-2026-1529

cve-icon Vulnrichment

Updated: 2026-02-09T20:51:11.825Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-09T20:15:55.883

Modified: 2026-02-10T02:15:52.253

Link: CVE-2026-1529

cve-icon Redhat

Severity : Important

Publid Date: 2026-02-09T18:21:00Z

Links: CVE-2026-1529 - Bugzilla