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CVE-2026-15573

Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher

Published: Aug 5, 2026Updated: Aug 31, 2026 Sources: CVE List NVDCWE-551
8.1HIGH
NVD MITRE
EPSS Score
0.3%
Top 75.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-551CWE-178

Affected Products

Red Hat
commercial·USaka redhat
build of keycloakOn-prem
Operating Systems / linux-distro
data gridOn-prem
Operating Systems / linux-distro
jboss enterprise application platform expansion packOn-prem
Operating Systems / linux-distro
single sign-onOn-prem
Operating Systems / linux-distro
Red Hat build of Keycloak 26.4On-premWeb App
Web & CMS Plugins
Red Hat build of Keycloak 26.4.14On-prem
Operating Systems / linux-distro
Red Hat build of Keycloak 26.6On-prem
Security Products / identity-access-mgmt
Red Hat build of Keycloak 26.6.5On-prem
Operating Systems / linux-distro
and 3 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-15573?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

References

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
and 3 more references View all →

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