CVE-2026-1931: Rent Fetch WordPress Plugin XSS Flaw

CVE-2026-1931 Overview

The Rent Fetch plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) via the keyword parameter in all versions up to and including 0.32.4. This vulnerability exists due to insufficient input sanitization and output escaping on user-supplied attributes. The flaw allows unauthenticated attackers to inject arbitrary web scripts into pages that will execute whenever any user accesses an affected page.

Critical Impact

Unauthenticated attackers can inject persistent malicious scripts that execute in the context of victim browsers, potentially leading to session hijacking, credential theft, defacement, or further attacks against site visitors and administrators.

Affected Products

• Rent Fetch WordPress Plugin versions up to and including 0.32.4
• WordPress sites utilizing the Rent Fetch plugin for property rental listings
• Any website visitor accessing pages containing injected malicious scripts

Discovery Timeline

• February 18, 2026 - CVE-2026-1931 published to NVD
• February 18, 2026 - Last updated in NVD database

Technical Details for CVE-2026-1931

Vulnerability Analysis

This Stored Cross-Site Scripting vulnerability (CWE-79) resides in the keyword parameter handling within the Rent Fetch plugin's options section. The vulnerability allows unauthenticated attackers to persistently inject malicious JavaScript code that gets stored on the server and subsequently executed in the browsers of users who visit affected pages. This is particularly dangerous because the malicious payload persists across sessions and can affect multiple users including site administrators.

The attack can be executed remotely over the network without requiring any authentication or user interaction, and the scope of impact extends beyond the vulnerable component itself, potentially affecting the confidentiality and integrity of user sessions and data.

Root Cause

The root cause is insufficient input sanitization and output escaping on user-supplied attributes in the keyword parameter. The vulnerable code is located in lib/admin/options-sections/options-general-section.php at line 225. When user input is not properly sanitized before being stored and not properly escaped when rendered, it creates an opportunity for script injection attacks.

Attack Vector

The attack is network-based and can be performed by unauthenticated users. Attackers craft malicious input containing JavaScript code and submit it through the keyword parameter. The malicious script is stored in the database and subsequently rendered without proper escaping whenever users access pages that display this data. When victims browse to these pages, the injected scripts execute in their browser context with full access to the page DOM, cookies, and session data.

The exploitation flow involves:

1. Attacker identifies the vulnerable keyword parameter input
2. Malicious JavaScript payload is crafted and submitted
3. Payload is stored in the WordPress database without proper sanitization
4. When any user accesses the affected page, the stored script executes
5. Attacker can steal session tokens, modify page content, or redirect users

Detection Methods for CVE-2026-1931

Indicators of Compromise

• Unexpected JavaScript code in database entries related to Rent Fetch plugin settings
• Anomalous script tags or event handlers in page source code on property listing pages
• Unusual outbound requests to unknown domains from user browsers
• Reports from users experiencing unexpected behavior or redirects on the website
• Web application firewall logs showing blocked XSS patterns targeting the keyword parameter

Detection Strategies

• Implement web application firewall rules to detect and block XSS patterns in POST requests to Rent Fetch plugin endpoints
• Monitor database tables used by the Rent Fetch plugin for suspicious content containing <script> tags or JavaScript event handlers
• Use browser-based Content Security Policy (CSP) violation reporting to identify unauthorized script execution
• Deploy WordPress security plugins that scan for stored XSS patterns in plugin data

Monitoring Recommendations

• Enable detailed logging for all input to the Rent Fetch plugin administrative interfaces
• Configure real-time alerting for CSP violations that may indicate XSS attempts
• Regularly audit stored content in the plugin's database tables for malicious payloads
• Monitor for unusual patterns in user session behavior that may indicate session hijacking

How to Mitigate CVE-2026-1931

Immediate Actions Required

• Update the Rent Fetch plugin immediately to a patched version newer than 0.32.4
• Review the WordPress database for any stored malicious scripts in Rent Fetch plugin tables
• Clear any cached pages that may contain the injected malicious content
• Consider temporarily disabling the plugin until the update can be applied

Patch Information

A security fix has been committed to address this vulnerability. The patch implements proper input sanitization and output escaping for the keyword parameter. Administrators should update to the latest version of the Rent Fetch plugin available in the WordPress plugin repository. The fix can be reviewed in the GitHub commit and the WordPress changeset.

Workarounds

• Implement a Web Application Firewall (WAF) with rules to filter XSS patterns targeting the Rent Fetch plugin
• Add Content Security Policy headers to restrict script execution to trusted sources only
• Restrict access to the plugin's administrative functions to trusted IP addresses
• Manually sanitize existing stored keyword parameter values in the database

# Content Security Policy header configuration for Apache (.htaccess)
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'"