Advanced Custom Fields: Extended 0.9.2.2 - 0.9.2.6 - Unauthenticated Privilege Escalation via Front-End User Insert Action

Description

The plugin does not restrict the role submitted through its front-end user forms to the roles the form actually offers, and its safeguard against privileged roles is incomplete, allowing unauthenticated visitors to register an account with elevated capabilities and then escalate it to administrator.
This is distinct from CVE-2025-14533: the guard added in 0.9.2.2 to address that report does not cover this path, which is why releases from 0.9.2.2 onwards are affected.