This vulnerability in flexmls Flexmls® IDX (up to version 3.15.9) is caused by improper neutralization of input during web page generation, resulting in a reflected cross-site scripting (XSS) flaw. An attacker can craft malicious input that is reflected in the web page without proper sanitization, enabling script execution in the victim's browser. The CVSS 3.1 base score is 7.1, indicating high severity, with network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and impacts on confidentiality, integrity, and availability.

Successful exploitation allows an attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to theft of sensitive information, session hijacking, or other malicious actions impacting confidentiality, integrity, and availability. The CVSS vector indicates partial impact on all three security properties.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch or official fix is available, users should consider applying input validation and output encoding controls where possible to mitigate reflected XSS risks. Monitor vendor channels for updates regarding an official fix.