LatePoint < 5.7.4 - Authenticated Privilege Escalation via the 'settings[default_wp_role_for_customer]' Parameter

Description

The plugin is vulnerable to Privilege Escalation due to the OsSettingsController::update() handler iterating over attacker-supplied settings without an allowlist of permitted setting names or values, and OsSettingsHelper::prepare_value() performing no role allowlist validation before persisting the default_wp_role_for_customer setting (the restriction exists only in the UI dropdown and is never enforced server-side). This makes it possible for authenticated attackers holding a LatePoint role with the settings__edit capability (such as an agent or custom role) to overwrite the default WordPress role for new customers with administrator, causing any subsequently self-registered LatePoint customer account to be created with full WordPress administrator privileges.