Some of my site users are seeing site contents linked to a third party site (hijacked content). These links dont appear during "edits" but only visible at 'view'. I am not able to login as these users to troubleshoot. Once I change their password, these hijacked links go away at their end.
I can change everyone's password for now but what is the long term solution to prevent site hijacks like this. Have anyone experienced something like this? Do you know how I can overcome this security issue?