CVE-2026-15572

Description

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.

CVSS Vector

References

• https://access.redhat.com/errata/RHSA-2026:50846
• https://access.redhat.com/errata/RHSA-2026:50847
• https://access.redhat.com/errata/RHSA-2026:50848
• https://access.redhat.com/errata/RHSA-2026:50849
• https://access.redhat.com/security/cve/CVE-2026-15572
• https://bugzilla.redhat.com/show_bug.cgi?id=2499592