CVE-2026-4629 Keycloak: keycloak: privilege escalation through hardcoded role mapper injection

Medium 6.5 Published 30 Jun 2026 Updated 22 Oct 2026

A privileged user can inject a hardcoded role mapper to bypass restrictions and gain full administrative access to the realm.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-4629?

CVE-2026-4629 is a medium-severity vulnerability in Redhat Build of Keycloak, published on 30 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

A flaw was found in Keycloak. A highly privileged user with `manage-clients` permission can exploit this vulnerability by injecting a hardcoded role mapper into any client. This action allows the user to bypass existing scope restrictions and inject the `realm-admin` role into generated tokens, resulting in privilege escalation and full administrative access to the realm.

Weakness: CWE-266

Which versions are affected by CVE-2026-4629?

It affects 1 product.

Products include Redhat Build of Keycloak.

How do I fix CVE-2026-4629?

No fix has been published for CVE-2026-4629 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-4629 being exploited?

There is no known exploitation of CVE-2026-4629 in the wild and no public exploit code.

All Redhat Build of Keycloak vulnerabilities

Sources

Also known as GHSA-m4j4-8chj-8g5f.