This vulnerability in Google Maps GPX Viewer (<= 3.6) involves improper input sanitization leading to reflected Cross-site Scripting (XSS). An attacker can craft malicious input that is reflected in the web page output without proper neutralization, potentially enabling script execution in users' browsers. The CVSS 3.1 base score is 7.1, with vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L, indicating network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and low impact on confidentiality, integrity, and availability.

Successful exploitation could allow an attacker to execute arbitrary scripts in the context of the victim's browser session, potentially leading to information disclosure, session hijacking, or other user-targeted attacks. The vulnerability affects confidentiality, integrity, and availability to a limited extent. There are no reports of active exploitation in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users and administrators should exercise caution when handling untrusted input and consider implementing web application firewall (WAF) rules to detect and block reflected XSS attempts. Avoid clicking on suspicious links that may exploit this vulnerability.