Thanks for your prompt response.
As far as I can see, all the changes have been made to the child theme.
After inspection of the console, it looks like no css files have been loaded.

@DocDigit it is an old version, this version https://wpscan.com/vulnerability/993a95d2-6fce-48de-ae17-06ce2db829ef/
Since it is a production website, I would like – if possible – to first update to a safe version of tagdiv composer or at least patch this, while maintaining compatibility.

• This reply was modified 2 years by gresakg.

Thanks, Bettina, but you did not answer my question. I know how to code and I have a serious security issue so please transfer me to someone more technical?