CVE-2026-15573 Keycloak-services: keycloak-services: authorization bypass via unnormalized uri matching in pathmatcher
Attackers can bypass authorization checks by manipulating URI normalization, allowing unauthorized access to restricted administrative areas in Keycloak.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-15573?
CVE-2026-15573 is a high-severity missing authorization vulnerability in Redhat Build of Keycloak, published on 5 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-15573?
1 open source package ship an affected version, including keycloak. It affects 4 products.
| Package | Affected | Fixed in |
|---|---|---|
keycloak Bitnami | From 26.4.0 | 26.4.14, 26.6.5 |
Products include Redhat Build of Keycloak, Redhat Data Grid, Redhat Jboss Enterprise Application Platform Expansion Pack, Redhat Single Sign-On.
How do I fix CVE-2026-15573?
Upgrade keycloak to a fixed version for your release line: 26.4.14 or 26.6.5.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-15573 being exploited?
There is no known exploitation of CVE-2026-15573 in the wild and no public exploit code.
Other vulnerabilities in Redhat Build of Keycloak
- CVE-2026-15572 Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
- CVE-2026-3047 Keycloak SAML Broken has Authentication Bypass by Primary Weakness
- CVE-2026-16102 Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers
- CVE-2026-1609 Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users
- CVE-2026-11800 Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion
Sources
Also known as BIT-keycloak-2026-15573, GHSA-6j7g-hr6v-3hxc.