CVE-2026-15572

Descripción

A flaw was found in Keycloak-s Dynamic Client Registration (DCR) security policy management. The -Allowed Protocol Mapper Types- policy, which restricts which types of data mappers a client can use, fails to re-validate the mapper type during a client update if the mapper-s configuration remains unchanged. An attacker with client registration privileges can exploit this by first registering an allowed mapper type with a malicious configuration and then swapping it for a restricted, high-privilege mapper type (such as one that hardcodes administrative roles). This allows the attacker to gain full administrative access to the Keycloak realm.