CVE-2026-4282
Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseobjectprovider isolation flaw
CVSS Score
7.4
EPSS Score
0.0%
EPSS Percentile
10th
A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an unauthenticated attacker to forge authorization codes. Successful exploitation can lead to the creation of admin-capable access tokens, resulting in privilege escalation.
| CWE | CWE-653 |
| Vendor | red hat |
| Product | red hat build of keycloak 26.2 |
| Published | Apr 2, 2026 |
| Last Updated | Apr 7, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
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 26.2.15
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 26.4.11
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:6475 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:6476 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:6477 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:6478 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-4282 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2448061
Credits
Red Hat would like to thank chungkn (OneMount Group) for reporting this issue.