CVE-2026-4282

HIGH

Keycloak: keycloak: privilege escalation via forged authorization codes due to singleuseobjectprovider isolation flaw

Title source: cna
STIX 2.1

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.

References (6)

Core 6
Core References
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:6475
https://access.redhat.com/errata/RHSA-2026:6475
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:6476
https://access.redhat.com/errata/RHSA-2026:6476
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:6477
https://access.redhat.com/errata/RHSA-2026:6477
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:6478
https://access.redhat.com/errata/RHSA-2026:6478
Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-4282
Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat
RHBZ#2448061
https://bugzilla.redhat.com/show_bug.cgi?id=2448061

Scores

CVSS v3 7.4
EPSS 0.0002
EPSS Percentile 5.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-653
Status published
Products (12)
org.keycloak/keycloak-services 0 - 26.5.7Maven
Red Hat/Red Hat build of Keycloak 26.2 26.2-18
Red Hat/Red Hat build of Keycloak 26.2 26.2.15-1
Red Hat/Red Hat build of Keycloak 26.2.15
Red Hat/Red Hat build of Keycloak 26.4 26.4-14
Red Hat/Red Hat build of Keycloak 26.4 26.4.11-1
Red Hat/Red Hat build of Keycloak 26.4.11
redhat/build_of_keycloak
redhat/build_of_keycloak 26.2
redhat/build_of_keycloak 26.2.15
... and 2 more
Published Apr 02, 2026
Tracked Since Apr 02, 2026