CVE-2026-4282

EUVD-2026-18208
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.4 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 13%
Affected Products (NVD)
VendorProductVersion
redhatbuild_of_keycloak
-
redhatbuild_of_keycloak
26.2
redhatbuild_of_keycloak
26.2.15
redhatbuild_of_keycloak
26.4
redhatbuild_of_keycloak
26.4.11
𝑥
= Vulnerable software versions
Common Weakness Enumeration
References
https://access.redhat.com/errata/RHSA-2026:6475
https://access.redhat.com/errata/RHSA-2026:6476
https://access.redhat.com/errata/RHSA-2026:6477
https://access.redhat.com/errata/RHSA-2026:6478
https://access.redhat.com/security/cve/CVE-2026-4282
https://bugzilla.redhat.com/show_bug.cgi?id=2448061