Improper isolation or compartmentalization in Keycloak - CVE-2026-4282
Published: September 10, 2026
Vulnerability identifier: #VU148939
CSH Severity: Medium
CVSS v4: 9.1 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-4282
CWE-ID: CWE-653
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to escalate privileges.
The vulnerability exists due to improper isolation or compartmentalization in the SingleUseObjectProvider global key-value store when handling authorization codes. A remote attacker can forge authorization codes to escalate privileges.
Successful exploitation can result in the creation of admin-capable access tokens.
Affected software
Keycloak
Red Hat build of Keycloak
Red Hat build of Keycloak
How to mitigate CVE-2026-4282
Install security update from vendor's website.
Keycloak - update to 26.5.7
Red Hat build of Keycloak - addressed in versions 26.2.15, 26.4.11
Red Hat build of Keycloak - addressed in versions 26.2.15, 26.4.11