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Vulnerability record · CVE-2026-15573 · published 5 August 2026

CVE-2026-15573: Redhat build of keycloak vulnerability

Redhat · Build Of Keycloak

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.

8.1 CVSS 3.1 High EPSS 0.46% · top 62.7% CWE-551 · CWE-551CWE-178 · CWE-178
8.1CVSS 3.1 base score
0.46%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
6References
31 Aug 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:50846 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:50847 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:50848 Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:50849 Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-15573 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2499593 Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-15573), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.