Vulnerability in Red Hat Build Of Keycloak
CVE-2026-15573
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (39.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Red Hat Build Of Keycloak
- Red Hat Build Of Keycloak 26.4 — versions 26.4-22, 26.4.14-1
- Red Hat Build Of Keycloak 26.4.14
- Red Hat Build Of Keycloak 26.6 — versions 26.6-11, 26.6.5-1
- Red Hat Build Of Keycloak 26.6.5
- Red Hat Data Grid 8
- Red Hat Jboss Enterprise Application Platform Expansion Pack
- Red Hat Single Sign-On 7
- Red Hat Build Of Keycloak
- Red Hat Data Grid — versions 8.0
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-15573 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:50846 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:50847 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:50848 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:50849 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-15573?
- CVE-2026-15573 is a high-severity vulnerability in Red Hat Build Of Keycloak, classified under CWE-551. CVSS score: 8.1/10. Published 2026-08-05.
- How severe is CVE-2026-15573?
- High severity. CVSS v3 base score is 8.1 out of 10.