Update Hikashop 3.1.1 request for Hikashop 2.6.4

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.7.1
-- PHP version -- : 5.6.30
-- Browser(s) name and version -- : Firefox

Hi,
Do the security issue (correted by HS 3.1.1) exist on Hikashop 2.6.4? We are actualy bulding our new website on HS 3.xx but for many reason the old one online is yet, for few weeks, on HS 2.6.4. Any security pb on this version?
Best R

Again thanks for your infos and always quick answers despite of our sometimes naives questions. I didn't configure any filter in the display menu (Screenshot below)...

We likewise appreciate that HikaShop shared the patch for older sites. In an abundance of caution, we applied it to ALL of our older HikaShop sites, several of which may not be upgraded to the 3 series for a little while longer due to the extensive testing required for integrations and customization.

One never knows when a curious client might decide to play with the filter sorting feature and I don't want to have to worry about remembering that by enabling it later, we'd be opening a known security hole. Best approach is to apply the one line patch and know you're covered!