40 email span letters in wholesale reg form with captcha

  • Hi Shamim, yestarday I had this problem:
    I got about 40 email letters from one email address
    https://prnt.sc/ydyrrt
    in last message i see try inplement in website sql injection:
    (select(0)from(select(sleep(15)))v)/*\’+(select(0)from(select(sleep(15)))v)+\’\”+(select(0)from(select(sleep(15)))v)+\”*/
    0\”XOR(if(now()=sysdate(),sleep(15),0))XOR\”Z
    0\’XOR(if(now()=sysdate(),sleep(15),0))XOR\’Z
    if(now()=sysdate(),sleep(15),0)
    – there is part of it

    Why did I get this problem, because I have the captcha installed? https://prnt.sc/ybgsgd
    What can I do to prevent this happening again?

    Thanks, Sergey

    The page I need help with: [log in to see the link]

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