This indicates an attack attempt against a Cross-Site Scripting vulnerability in nopCommerce.
The vulnerability is due to insufficient validation of packet when the vulnerable software handles a maliciously crafted request. A remote attacker may be able to exploit this to execute arbitrary script code within the context of the application, via a crafted HTTP request.
nopCommerce store prior to 4.30
System Compromise: Remote attackers can execute arbitrary script code within the context of the target user's browser.
Apply the most recent upgrade or patch from the vendor.