CVE-2026-1529
Org.keycloak.services.resources.organizations: keycloak: unauthorized organization registration via improper invitation token validation
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-347 |
| Vendor | red hat |
| Product | red hat build of keycloak 26.2 |
| Published | Feb 9, 2026 |
| Last Updated | Jun 30, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2.13
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4.9
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2363 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2364 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2365 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:2366 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-1529 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2433783 security.access.redhat.com: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1529.json
Credits
Red Hat would like to thank Joy Gilbert (gwthr) and Reynaldo Immanuel for reporting this issue.