Authorization bypass through user-controlled key in Keycloak - CVE-2026-15945
Published: September 10, 2026
Vulnerability identifier: #VU148957
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-15945
CWE-ID: CWE-639
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive group attributes and configuration.
The vulnerability exists due to authorization bypass through a user-controlled key in the group search functionality of the Keycloak server administrative API when searching for a child group the user is authorized to view. A remote user can search for an authorized child group to view full details of an unauthorized parent group and disclose sensitive group attributes and configuration.
Fine-Grained Admin Permissions v2 must be enabled.
Affected software
Keycloak
How to mitigate CVE-2026-15945
Install security update from vendor's website.
Keycloak - update to 26.7.2