Medium [CVE-2026-16072] Organization invitation link exposure allows unauthorized member creation

A flaw was found in the organization management component of Keycloak. A delegated administrator with permission to manage organizations can create an invitation for a non-existent email address and then retrieve the secret registration link directly through the application programming interface.

By using this link, the administrator can create new user accounts and add them to the organization without having the required user management permissions or access to the invited email account. This allows an administrator to bypass security boundaries and add unauthorized members to an organization.

The Red Hat Product Security team has assessed the severity of this vulnerability as Moderate, given that exploitation requires the attacker to already possess high-level administrative privileges (manage-organizations).

Successful exploitation allows an attacker to bypass the manage-users permission boundary to create new managed user accounts and add them to an organization without mailbox verification. The vulnerability's root cause is the unintended exposure of the registration bearer link in the REST API response for pending invitations.

Weakness: CWE-497. Affected Red Hat products: Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.6.7.