Database Error in register.php for table humanverify
 

Today I received an email for my forums
Quote:
Datenbankfehler in vBulletin 3.8.2:

Invalid SQL:

DELETE FROM humanverify WHERE hash = '27dc022e481524455808387e2772b9a0' AND answer = '�%1C%1B-�!D69�\ZGGDGHIG;';

MySQL-Fehler : Illegal mix of collations (ascii_general_ci,IMPLICIT) and (utf8_general_ci,COERCIBLE) for operation '='
Fehler-Nr. : 1267
Fehler-Zeit : Wednesday, 29.09.2010 @ 08:49:18
Datum : Wednesday, 29.09.2010 @ 08:49:18
Skript : /register.php?do=addmember
Referrer : /register.php?
IP-Adresse : 173.242.*.*
Benutzername : BarakkaBoyQ1A2nf
Klassenname : vB_Database_MySQLi
MySQL-Version :

The unescaped backslash in the answer part seems very suspicious, so I'm wondering now if this is just a bug that appeared naturally in vBulletin, or if someone needed a few tries to get an SQL injection right there... I'll check my database and server for anything unusual now, but maybe someone can already help figuring out what was going on there.