Hikashop Vulnerability

Hi,

That error message is not in HikaShop.

What indicates the information you provided and the information on that thread of the Joomla forum is that the file /administrator/components/com_hikashop/helpers/helper.php has been modified by an attacker.
But that doesn't necessarily means that the attacker went through HikaShop to attack your website. It could be any other extension out there.
Once the attacker has access your website with enough priviledge, it can change anything in there. For example, if the attacker found the password of your super admin account, they can install their own extension which can do anything to the files of your website.
Reinstalling HikaShop will remove the modification in the helper.php file but if the attacker still has access to the website via another way, he will be able to add back his modified helper.php file easily. So while reinstalling HikaShop is a short time fix for that error message, it's not a solution.


So unfortunately, it's hard to conclude on anything with the information provided so far.
What I can say for now is that there are no known vulnerabilities in HikaShop at the moment.

I would recommend you install RS Firewall or a similar security extension on your website:
extensions.joomla.org/extension/rsfirewall/
With it, you'll be able to protect your website while at the same time getting information on how the attacker is able to infiltrate your website.
There are also security services like sucuri.net/website-security-platform/help-now/
They can analyze the situation and sort it out for you. It's more costly but they do everything for you.