I don't know for sure how or what happened. I'm NOT a coder. I'm just letting you know what happened to me and what to look for. It might just be a coincidence. Just before I put in the mod A known spamer got in. That is why I put in the mod. They were in for only 5 minutes before I saw them and baned them. Now that I have upgraded to 4.1.3 I have reinstalled the mod but I keep a sharp eye on the file listed above to see if it changes. So far so good.
They might have used the exploit that 4.1.2 had. Here is the spamers information. Be on the look out for them.
:
kmalinowska@bx8.pl
Birthday : April 13, 1961
Referrer: N/A
IP Address: 69.197.186.218
Location : Ethiopia
Year. : 3rd
Make. : WokskidaWeima
Gender : Female