The irony of your Post and the issue is well very ironic. Using cgi-bin in the Forum Topic URL caused a 403 forbidden error when trying to view this topic. I had to rename the URL to cgi_bin in order to view this topic since cgi-bin is explicitly blocked in URLs by BPS since this is a dangerous thing to allow.
There is a cgi-bin security rule in the root .htaccess file. Copy the entire BPS Query String Exploits section of code to BPS Custom Code, comment out the cgi-bin security filter with a Pound sign #, Save your custom code and then go to the Security Modes page, click the AutoMagic buttons and activate root folder BulletProof Mode.
the rest of the BPS Query String Exploits code is here #RewriteCond %{THE_REQUEST} cgi-bin [NC,OR] the rest of the BPS Query String Exploits code is here