# CVE-2026-15573

## Summary

- **CVE ID:** CVE-2026-15573
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)
- **CWE:** CWE-551
- **Published:** Aug 5, 2026
- **Last Modified:** Aug 31, 2026

## 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.

## Affected Products

- Red Hat — Red Hat build of Keycloak 26.4 (26.4-22)
- Red Hat — Red Hat build of Keycloak 26.4 (26.4.14-1)
- Red Hat — Red Hat build of Keycloak 26.6 (26.6-11)
- Red Hat — Red Hat build of Keycloak 26.6 (26.6.5-1)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-15573)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2499593)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50846)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50847)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50848)
- [CNA](https://access.redhat.com/errata/RHSA-2026:50849)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.32%
- **EPSS Percentile:** 24.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._