Question
How to disable ModSecurity in Plesk?
Answer
Server-wide level:
via Plesk UI
- 
Go to Tools & Settings > Web Application Firewall (ModSecurity) page.
 - 
Set Web application firewall mode to Off and press OK button.
 
via CLI
Domain level:
via Plesk UI
- 
Go to Domains > example.com > Web Application Firewall page.
 - 
Set Web application firewall mode to Off and press OK button.