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 CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Red Hat Red Hat build of Keycloak 26.4 affected
Version Status Constraints
26.4.14-1 unaffected < *
Red Hat Red Hat build of Keycloak 26.4 affected
Version Status Constraints
26.4-22 unaffected < *
Red Hat Red Hat build of Keycloak 26.4 affected
Version Status Constraints
26.4-22 unaffected < *
Red Hat Red Hat build of Keycloak 26.4.14 unaffected —
Red Hat Red Hat build of Keycloak 26.4.14 unaffected —
Red Hat Red Hat build of Keycloak 26.6 affected
Version Status Constraints
26.6.5-1 unaffected < *
Red Hat Red Hat build of Keycloak 26.6 affected
Version Status Constraints
26.6-11 unaffected < *
Red Hat Red Hat build of Keycloak 26.6 affected
Version Status Constraints
26.6-11 unaffected < *
Red Hat Red Hat build of Keycloak 26.6.5 unaffected —
Red Hat Red Hat build of Keycloak 26.6.5 unaffected —
Red Hat Red Hat build of Keycloak 26.6.5 unaffected —
Red Hat Red Hat Data Grid 8 affected —
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack affected —
Red Hat Red Hat Single Sign-On 7 affected —

No data.

No data.

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Project Subscriptions

Vendors Products
Redhat Subscribe
Build Keycloak Subscribe
Jboss Data Grid Subscribe
Jbosseapxp Subscribe
Red Hat Single Sign On Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://access.redhat.com/errata/RHSA-2026:50846 cve-icon
https://access.redhat.com/errata/RHSA-2026:50847 cve-icon
https://access.redhat.com/errata/RHSA-2026:50848 cve-icon
https://access.redhat.com/errata/RHSA-2026:50849 cve-icon
https://access.redhat.com/security/cve/CVE-2026-15573 cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2499593 cve-icon
History

Wed, 05 Aug 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 05 Aug 2026 19:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-178
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

 ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 05 Aug 2026 17:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:build_keycloak: cpe:/a:redhat:build_keycloak:26.4::el9
cpe:/a:redhat:build_keycloak:26.6::el9
References

Wed, 05 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 05 Aug 2026 15:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285

Wed, 05 Aug 2026 14:45:00 +0000

Type Values Removed Values Added
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.
Title Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
First Time appeared Redhat
Redhat build Keycloak
Redhat jboss Data Grid
Redhat jbosseapxp
Redhat red Hat Single Sign On
CPEs cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:jboss_data_grid:8
cpe:/a:redhat:jbosseapxp
cpe:/a:redhat:red_hat_single_sign_on:7
Vendors & Products Redhat
Redhat build Keycloak
Redhat jboss Data Grid
Redhat jbosseapxp
Redhat red Hat Single Sign On
References
Metrics cvssV3_1

{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-05T19:33:13.433Z

Reserved: 2026-07-13T07:37:48.551Z

Link: CVE-2026-15573

cve-icon Vulnrichment

Updated: 2026-08-05T15:43:21.706Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-05T20:30:06Z

Weaknesses