CVE-2026-15573
Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | red hat |
| Product | red hat build of keycloak 26.4 |
| Published | Aug 5, 2026 |
| Last Updated | Aug 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4
All versions affected Red Hat / Red Hat build of Keycloak 26.4.14
All versions affected Red Hat / Red Hat build of Keycloak 26.4.14
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6
All versions affected Red Hat / Red Hat build of Keycloak 26.6.5
All versions affected Red Hat / Red Hat build of Keycloak 26.6.5
All versions affected Red Hat / Red Hat build of Keycloak 26.6.5
All versions affected Red Hat / Red Hat Data Grid 8
All versions affected Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack
All versions affected Red Hat / Red Hat Single Sign-On 7
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50846 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50847 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50848 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:50849 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-15573 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2499593
Credits
Red Hat would like to thank Sanil Dulal for reporting this issue.