CVE-2025-31011: SimplyRETS Real Estate IDX XSS Vulnerability

CVE-2025-31011 Overview

CVE-2025-31011 is a reflected cross-site scripting (XSS) vulnerability in the ReichertBrothers SimplyRETS Real Estate IDX WordPress plugin. The flaw affects all versions of simply-rets up to and including 3.2.2. The plugin fails to neutralize user-supplied input before reflecting it back into web pages generated for visitors. Attackers can craft malicious URLs that execute arbitrary JavaScript in a victim's browser when clicked. The issue is tracked under CWE-79 and requires user interaction to trigger, but no authentication is needed.

Critical Impact
Successful exploitation lets attackers run arbitrary JavaScript in the victim browser, enabling session theft, credential harvesting, and redirection to attacker-controlled infrastructure.

Affected Products

ReichertBrothers SimplyRETS Real Estate IDX (simply-rets) plugin for WordPress
All versions from initial release through 3.2.2
WordPress sites hosting real estate listings that integrate the SimplyRETS IDX plugin

Discovery Timeline

2025-04-15 - CVE-2025-31011 published to NVD
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-31011

Vulnerability Analysis

The vulnerability is a reflected cross-site scripting flaw in the SimplyRETS Real Estate IDX plugin. The plugin accepts request parameters and embeds them directly into the HTML response without proper output encoding or input sanitization. When a user clicks a crafted link, the malicious payload reflects back into the page and executes in the browser context of the target WordPress site.

Reflected XSS in a real estate IDX plugin is particularly relevant because property search and listing pages typically receive heavy public traffic. Attackers can distribute weaponized URLs through phishing emails, social media posts, or compromised referrer sites. The Patchstack advisory confirms that exploitation requires the victim to follow an attacker-controlled link.

Root Cause

The root cause is improper neutralization of input during web page generation. The plugin's request handlers fail to apply WordPress sanitization helpers such as esc_html(), esc_attr(), or wp_kses() to user-controlled parameters before echoing them into the rendered DOM. This violates the core principle of contextual output encoding for any data that crosses a trust boundary.

Attack Vector

The attack is network-based and requires user interaction. An attacker crafts a URL targeting a vulnerable SimplyRETS endpoint on a WordPress site running version 3.2.2 or earlier. The URL contains a JavaScript payload in a reflected parameter. When the victim opens the link in an authenticated browser session, the payload executes with the privileges of that session. The scope is changed, meaning the injected script can act beyond the vulnerable component and affect other resources accessible to the victim.

For technical specifics, see the Patchstack Vulnerability Report.

Detection Methods for CVE-2025-31011

Indicators of Compromise

Web server access logs containing requests to SimplyRETS endpoints with URL parameters that include <script>, javascript:, onerror=, or onload= substrings
Unexpected outbound requests from visitor browsers to unfamiliar domains immediately after loading a property listing or search page
Reports from users of suspicious popups, redirects, or credential prompts on pages served by the simply-rets plugin

Detection Strategies

Inspect HTTP request logs for encoded XSS payloads such as %3Cscript%3E, %3Cimg, and %3Csvg targeting parameters consumed by SimplyRETS
Compare reflected query parameters against rendered HTML responses to identify unsanitized output paths
Deploy a Web Application Firewall (WAF) rule set that flags reflected XSS patterns on WordPress endpoints

Monitoring Recommendations

Enable WordPress audit logging to capture plugin activity and unusual referrer chains
Forward web access logs into a SIEM and alert on requests matching XSS signatures against simply-rets paths
Monitor browser-side errors and Content Security Policy (CSP) violation reports to surface injection attempts in production

How to Mitigate CVE-2025-31011

Immediate Actions Required

Identify all WordPress installations running the SimplyRETS Real Estate IDX plugin and verify the installed version
Update the simply-rets plugin to a version released after 3.2.2 once the vendor publishes a fix
Apply a virtual patch via WAF rules that block reflected XSS payloads against SimplyRETS endpoints until the plugin is updated

Patch Information

As of the NVD record, the vulnerability affects SimplyRETS Real Estate IDX through version 3.2.2. Administrators should monitor the Patchstack advisory and the plugin's WordPress.org listing for an updated release that addresses CVE-2025-31011.

Workarounds

Deactivate the SimplyRETS Real Estate IDX plugin if a patched version is not yet available and the functionality is non-critical
Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources on pages rendered by the plugin
Restrict access to SimplyRETS endpoints behind authentication or IP allowlisting where business requirements permit

bash

# Configuration example: nginx rule to block common reflected XSS patterns
location ~* /simply-rets/ {
    if ($args ~* "(<|%3C)\s*script|javascript:|onerror=|onload=") {
        return 403;
    }
}