Description
A flaw was found in Keycloak's Authorization Services. The component responsible for matching request paths to security policies (PathMatcher) does not properly normalize URIs before comparison. By adding extra characters like a trailing slash or matrix parameters to a URL, an attacker can trick the system into applying a less restrictive security policy than intended. This allows an authenticated user to access administrative or restricted areas they should not have permission to see.
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_keycloak26.4 – 26.4.14
- RedHat / data_grid8.0 – 8.0
- RedHat / jboss_enterprise_application_platform_expansion_pack
- RedHat / single_sign-on7.0 – 7.0
References
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:50846
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:50847
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:50848
- VENDOR_ADVISORYhttps://access.redhat.com/errata/RHSA-2026:50849
- VENDOR_ADVISORYhttps://access.redhat.com/security/cve/CVE-2026-15573
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=2499593
Updated 5m ago · 8 sources