CVE-2025-53351 describes a reflected Cross-site Scripting (XSS) vulnerability in Fidelo Snippet versions up to 1.12. The issue is caused by improper neutralization of input during web page generation, enabling attackers to inject malicious scripts that execute in users' browsers. The CVSS 3.1 base score is 7.1 (high), with attack vector network, low attack complexity, no privileges required, user interaction required, scope changed, and impacts on confidentiality, integrity, and availability rated low to low. The vulnerability is publicly disclosed but lacks vendor patch information.

Successful exploitation of this vulnerability can allow an attacker to execute arbitrary scripts in the context of the victim's browser, potentially leading to theft of sensitive information, session hijacking, or other malicious actions impacting confidentiality, integrity, and availability to a limited extent. The reflected nature of the XSS requires user interaction. No known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider implementing web application firewall (WAF) rules to detect and block reflected XSS attempts and apply input validation or output encoding where possible. Monitor Fidelo Software GmbH advisories for updates and apply patches promptly once available.