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.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected products
- RedHat / build_of_keycloak
- RedHat / build_of_keycloak26.2 – 26.2
- RedHat / build_of_keycloak26.2.15 – 26.2.15
- RedHat / build_of_keycloak26.4 – 26.4
- RedHat / build_of_keycloak26.4.11 – 26.4.11
References
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:6475
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:6476
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:6477
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:6478
- VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-4636
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2450251
Updated 8m ago · 8 sources