Clickjacking (also known as a "UI redress attack") is a malicious technique intended to trick a user into clicking on something different from they perceive they are clicking on.Plesk users can be vulnerable to such type of attack when Plesk is opened within frames (separate areas of web pages) on other (malicious) sources. To protect Plesk from clickjacking, you can use the sameOriginOnly setting in the panel.ini file. This setting allows to prevent Plesk pages from opening within frames on other domains.
For Linux –
Login to your Plesk onyx server with root user with your favorite ssh client
Edit the file “panel.ini” file located at “/usr/local/psa/admin/conf” with the command
If the file does not exist create it with “touch” command.
Add the following line in /conf file
sameOriginOnly = true
Save the file and you are done.