A user reported the above message generated by their corporate security system. I am running 7.5.3.

The security system is ESET NOD32 V4 Business Edition.

Just before my browser crashed, I got this alert...

Yep. corporate firewalls are tough to deal with.
You never know what they have instituted.
I deal with them all of the time.
Most times with no success.

But anyway for starters v7.5.3 has been patched with a security update which it appears you are not using.
So even if you upgrade right now. it will not correct prior hacking to your board, if that is the case.

If you where hacked you'll need to patch your forums, make sure you're using stock files (and that they haven't been altered by a hacker), and make sure your webspace doesn't have malicious files lingering around which would allow a remote hacker to continue compromising your system.

I actually just did a cleanup of a really nasty hack last week, they aren't pretty and you as the owner are really responsible for hosting these files; after a while Google and antivirus people will start flagging your site as malicious and users will start getting warnings about your site hosting malicious content if you allow it to just sit there.

You should look into either hiring someone to fix your site, or if you think you can do it yourself (which I highly advise against as with disaster recovery is easy to miss something) you'll need to use a utility like beyond compare to compare your forum files to that of the stock files and compare differences, then you'll need to use ssh and grep to look for any suspicious edits to files and you'll need to look at recently edited/new files on the server.

Which of the two initial messages in this topic does the above reference? It appears that "driv" hijacked my topic with a different subject so I'm not sure to which one the comments refer.

I have no idea where Driv got his info for his post image.
You edited your post and where your error message came from is not displayed.
Possibly you had posted a url and he tested it.

I went by that the latest security patch addressed a very very serious security hole. Where someone could edit your scripts.
In fact it delayed progress on the next version release.
Not so much the patch itself but finding the actual hack in the scripts before the patch.

So if you are getting nagged with security risks then that could possibly be the culprit.

driv reported what his browser said, when he went to your site, so he didn't hijaack it

he was confirming that you prolly have an issue with your board security.

then we get to Giz who noticed that you aren't patched and his reply.

sooo.. the thread is still about your initial post

but maybe i'm wrong too

I see thanks. I thought driv was just posting something they got someplace on their system.

When I go to the download area I see the full version files and I see the patch files. Which do I need? Thanks.

Since your running 7.5.3 you need to full version to upgrade to 7.5.6. The patch is if you were running 7.5.6 already

Well it is suggested to upgrade. there is a security patch for your version in the right side of the member area.
But if you were hacked already. The patch will only stop future attacks not repair past issues.