The totalprocessing Nomupay Payment Processing Gateway versions up to 7.1.6 suffer from a reflected cross-site scripting vulnerability due to improper input neutralization during web page generation. This vulnerability allows attackers to inject malicious scripts that execute when a user interacts with crafted web content, potentially compromising user data and session integrity. The CVSS v3.1 base score is 7.1, indicating a high severity with network attack vector, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability.

Successful exploitation of this reflected XSS vulnerability can lead to partial compromise of confidentiality, integrity, and availability of the affected system or user data. Attackers could execute arbitrary scripts in the context of the victim's browser, potentially leading to session hijacking, information disclosure, or other malicious actions. However, no known exploits in the wild have been reported to date.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should exercise caution when interacting with untrusted input and consider implementing web application firewall (WAF) rules to detect and block reflected XSS attempts. Monitor vendor channels for updates regarding patches or official mitigations.