- Plesk Onyx for Linux
Cannot apply "Disable unused scripting languages" security option for a subdomain or additional domain in Subscriptions > example.com > WordPress > Check Security or Security in Plesk Onyx 17.8
The behavior is caused by Plesk bug EXTWPTOOLK-2323.
Until the fix becomes available, disable unused scripting languages manually:
Go to Domains > subdomain.example.com > Hosting Settings;
Disable all web scripting languages except PHP: