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At the phpFox forum, a client posted of a serious security vulnerability. We don't know the details but you might want to follow the answer to this thread, https://community.phpfox.com/forum/thread/56011/v4-4-3-security-vulnerability/ and we'll also follow it.
In case that thread is deleted, here's what the client says:
Just a heads up for those running v4.4.3, You site is vulnerable. There is a security vulnerability which give the hacker a admin access to your site as well as the root directory with shell access. I've archived all the info which should give a good picture of how it's being accomplished and sending it to phpfox.
and a screenshot of it: