Spam sent via my script

Yesterday I got an Email from my Host (udmedia.de):

"Dear ...
we had to block your used script

/ html / zenphoto / (ZenPhoto)

with immediate effect.
It allows attackers to send multiple e-mails to any recipient.
In the Interest of other customers you cant reactivate the script without improvement (update or deletion). If you use a freely available web software (CMS, news, etc. ..) we strongly recommend to update or switch to an alternative. In addition, we recommend that you change all your passwords."

I updated Zenphoto about six weeks ago...
What shall i do? Will an update solve the problem?

Thank you for support

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