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As we clean many sites infected by the VisitorTracker malware, we see vulnerabilities in multiple plugins being exploited by attackers.

For example, my colleagues John Castro and Marc-Alexandre Montpas analyzed many sites where hackers exploited quite an old version 1.4.6 of the FormCraft premium plugin (current version is 3.2.4). FormCraft 1.4.6 contains a file upload script that is not protected in any way. Which makes it really easy for an attacker to upload backdoors on vulnerable sites.

And here are logs entries that show how this vulnerability is being exploited in the wild:

Remember, both free and premium plugins and themes should always be up to date. If you can't update some software, you should remove it from your server. Alternatively, consider virtual patching provided by Website Firewalls

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