CVE-2026-105066 in Real Estate IDX Plugin
Summary
by MITRE • 10/14/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in SimplyRETS SimplyRETS Real Estate IDX simply-rets allows Reflected XSS.This issue affects SimplyRETS Real Estate IDX: from n/a through 3.2.9.
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Analysis
by VulDB Data Team • 10/14/2026
The identified security flaw represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-site Scripting or XSS. Specifically, this vulnerability manifests as a Reflected XSS within the SimplyRETS Real Estate IDX plugin for WordPress. The core technical issue stems from the application's failure to adequately sanitize or encode user-supplied input before it is rendered back into the web page in response to an HTTP request. In a reflected attack scenario, malicious script payloads are typically embedded within URLs or form submissions and delivered to victims via external links, emails, or other social engineering vectors. When the vulnerable component processes this input without proper validation against special characters such as angle brackets, quotes, or ampersands, it inadvertently executes the injected code in the context of the victim's browser session. This behavior directly aligns with CWE-79, which defines Cross-site Scripting (Reflected) as a weakness where web applications generate pages containing untrusted data without proper neutralization before putting that data into HTML output fields.
The operational impact of this vulnerability is significant because it allows an attacker to execute arbitrary JavaScript code within the browser environment of any user who interacts with the crafted malicious link while authenticated or even in some contexts, if session cookies are accessible via script. This can lead to a variety of severe consequences including account hijacking through theft of session tokens or authentication cookies, defacement of the website's appearance, redirection of users to phishing sites designed to steal credentials, and potentially keylogging activities that capture sensitive data entered by the victim. Since SimplyRETS is an IDX plugin used for displaying real estate listings on WordPress sites, the target audience often includes agents and brokers who handle sensitive client information. A successful exploitation could compromise not only the administrative accounts of site owners but also disrupt the integrity of property listing displays, leading to reputational damage and potential loss of business trust among clients relying on accurate and secure online presence.
From a threat intelligence perspective, this vulnerability maps closely to MITRE ATT&CK technique T1059.007, which covers JavaScript as an executable payload under Command and Scripting Interpreter. Attackers leverage this capability to perform client-side attacks that bypass server-side security controls by operating entirely within the browser's execution context. The reflection nature of the XSS means that persistent storage is not required for exploitation; instead, it relies on social engineering or link baiting techniques to trigger the payload delivery. This makes detection through traditional logging mechanisms more challenging as the malicious code does not reside in the database but is dynamically generated during request processing. Consequently, preventive measures must focus heavily on input validation and output encoding strategies rather than solely relying on storage-based sanitization protocols.
To mitigate this vulnerability, immediate action should be taken by updating the SimplyRETS Real Estate IDX plugin to version 3.2.10 or later, where the developers have presumably implemented fixes for improper neutralization of user inputs. Until an update is available, administrators can employ web application firewall rules that detect and block common XSS payload patterns in query parameters and POST data. Additionally, implementing Content Security Policy headers with strict directives regarding script sources can significantly reduce the impact by preventing unauthorized scripts from executing even if they are injected into the DOM. Developers should also adopt a defense-in-depth approach by ensuring all dynamic content is HTML-encoded before rendering and utilizing context-aware encoding techniques that distinguish between HTML body text, attribute values, JavaScript contexts, and CSS properties to prevent bypasses of naive filtering mechanisms. Regular security audits and penetration testing focused on input validation weaknesses are recommended to identify similar flaws in other components of the web application stack.