Issue with webform

Hello,
Help needed in our site, Cern welcome club. Our site has a registration webform. Today we had 5560 new FAKE registrations,
https://clubwelcome.web.cern.ch/admin/structure/webform/manage/cwc_registration_2020_2021/results/submissions?search=ncMUFCMU

There’s a way to block this? And avoid this in the future?

Thanks in advance!
Monica

Dear Monica,

You need to install the modules Captcha and ReCaptcha and add a captcha element into your webform.

It will prevent spam.