High severity · published Apr 2, 2026
CVE-2026-4282
Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseobjectprovider isolation flaw
7.4
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat build of Keycloak 26.2 · Red Hat
All versions, or not specified · source: vendor, CISA
RH
Red Hat build of Keycloak 26.4 · Red Hat
All versions, or not specified · source: vendor, CISA
BO
Build OF Keycloak · Redhat
26.2; 26.2.15; 26.4; 26.4.11 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-4282
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-4282
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6475
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6476
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6477
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:6478
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-4282
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2448061
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