CVE-2026-73354: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in ReichertBrothers SimplyRETS Real Estate IDX

CVE-2026-73354 is an unauthenticated Cross-Site Scripting (CWE-79) vulnerability in SimplyRETS Real Estate IDX software versions up to 3.2.8. The flaw results from improper neutralization of input during web page generation, enabling attackers to inject malicious scripts. The CVSS 3.1 score is 7.1 (high), 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 impacts to confidentiality, integrity, and availability at low levels. No known exploits in the wild or vendor patches are reported.

Successful exploitation can lead to execution of malicious scripts in the context of the victim's browser, potentially compromising user confidentiality, integrity, and availability of the application. The vulnerability is exploitable remotely without authentication but requires user interaction. The scope of impact includes partial loss of confidentiality, integrity, and availability.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, users should exercise caution with untrusted input and consider implementing web application firewalls or input validation as interim mitigations.