CVE-2026-103346: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Tomlister Payflex Payment Gateway

The vulnerability identified as CVE-2026-103346 affects Tomlister Payflex Payment Gateway and is caused by improper neutralization of input during web page generation, resulting in reflected cross-site scripting (XSS). This allows attackers to inject malicious scripts that execute in the context of the victim's browser. The affected versions include all releases from initial versions up to but not including 2.8.0. The CVSS 3.1 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 may execute arbitrary scripts in the context of the victim's browser, potentially leading to session hijacking, defacement, or other malicious actions impacting user trust and system security.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch or fix link is provided, users should monitor Tomlister's official channels for updates. Until a fix is available, consider applying input validation and output encoding controls as temporary mitigations to reduce the risk of reflected XSS.