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, when reflected by the web application, executes arbitrary scripts in the victim's browser. The CVSS 3.1 score is 7.1 (high), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, and impacts to confidentiality, integrity, and availability. The vulnerability is publicly known but no patch or vendor advisory has been provided in the input data.

Successful exploitation can allow attackers to execute arbitrary scripts in the context of the affected web application, potentially leading to partial compromise of confidentiality, integrity, and availability of user data or sessions. The reflected XSS requires user interaction and can be exploited remotely without authentication.

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