How to install ModSecurity?
The following options are possible:
Install ModSecurity in Plesk web interface: Go to Home > Tools & Settings > Updates and Upgrades and under the web hosting settings select ModSecurity .
Install ModSecurity in terminal using CLI: Connect to the server using SSH client, execute below command
# plesk installer --select-release-current --install-component modsecurity
In case of an additional license for ModSecurity is present, ruleset will be automatically updated.
For more details, visit Plesk Administrator Guide.