Description
A flaw was found in Keycloak. An authenticated user with the uma_protection role can bypass User-Managed Access (UMA) policy validation. This allows the attacker to include resource identifiers owned by other users in a policy creation request, even if the URL path specifies an attacker-owned resource. Consequently, the attacker gains unauthorized permissions to victim-owned resources, enabling them to obtain a Requesting Party Token (RPT) and access sensitive information or perform unauthorized actions.
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-2026-4636
Issue Tracking, X_Refsource_Redhat issue-tracking
x_refsource_redhat
RHBZ#2450251
https://bugzilla.redhat.com/show_bug.cgi?id=2450251
Scores
CVSS v3
8.1
EPSS
0.0001
EPSS Percentile
2.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-551
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