CVE-2026-15573 Keycloak — Exploit & Vulnerability Details HIGH

Parameter	Value
CVSS	8.1 (HIGH)
Vendor	Keycloak
Public PoC	No

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.

Attack Parameters

Attack Vector

Network

Can be exploited remotely

Attack Complexity

Low

Easy to exploit

Privileges Required

Low

Basic privileges needed

User Interaction

None

No user interaction needed

Impact Assessment

Confidentiality

High

Complete data leak

Integrity

High

Complete data modification

Availability

None

No disruption

CVSS Vector v3.1

Vulnerable Products

red hat:red hat data grid 8 red hat:red hat single sign-on 7 red hat:red hat jboss enterprise application platform expansion pack red hat:red hat build of keycloak 26.4 red hat:red hat build of keycloak 26.6.5 red hat:red hat build of keycloak 26.6 red hat:red hat build of keycloak 26.4.14