CVE-2026-1164: Easy Voice Mail WordPress Plugin XSS Flaw

CVE-2026-1164 Overview

The Easy Voice Mail plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the message parameter affecting all versions up to and including 1.2.5. The vulnerability stems from insufficient input sanitization and output escaping, allowing authenticated attackers with Administrator-level access to inject arbitrary web scripts into pages. These malicious scripts execute whenever any user accesses an injected page, potentially leading to session hijacking, credential theft, or further compromise of the WordPress installation.

Critical Impact

Authenticated attackers with Administrator privileges can inject persistent malicious scripts that execute in the browsers of all users viewing affected pages, enabling session hijacking, credential theft, and potential full site compromise.

Affected Products

• Easy Voice Mail WordPress Plugin versions up to and including 1.2.5
• WordPress installations using vulnerable Easy Voice Mail plugin versions

Discovery Timeline

• 2026-02-14 - CVE-2026-1164 published to NVD
• 2026-02-18 - Last updated in NVD database

Technical Details for CVE-2026-1164

Vulnerability Analysis

This Stored Cross-Site Scripting vulnerability exists in the Easy Voice Mail plugin for WordPress due to improper handling of user-supplied input in the message parameter. When an authenticated user with Administrator-level privileges submits a voice mail message, the plugin fails to properly sanitize the input before storing it in the database and subsequently fails to escape the output when rendering the content on web pages.

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), which is a common weakness in web applications where user input is incorporated into web pages without proper encoding or escaping. In this case, the flaw allows attackers to store malicious JavaScript code that persists in the application and executes in the context of other users' browsers.

While the requirement for Administrator-level access limits the initial attack surface, this vulnerability could be chained with other exploits or used in scenarios where a malicious administrator exists. The stored nature of the XSS means that the malicious payload persists and can affect multiple users over time.

Root Cause

The root cause of CVE-2026-1164 is insufficient input sanitization and output escaping in the Easy Voice Mail plugin. The vulnerable code paths can be found in the plugin's admin handling at easy-voice-mail-admin.php and public rendering at easy-voice-mail-public.php.

The plugin does not employ WordPress security functions such as wp_kses(), esc_html(), or esc_attr() to sanitize and escape the message parameter content before storing it in the database or rendering it in the browser. This allows HTML and JavaScript content to be preserved and executed when the page is loaded.

Attack Vector

The attack vector for this vulnerability is network-based, requiring user interaction. An authenticated attacker with Administrator-level access performs the following steps:

1. The attacker accesses the Easy Voice Mail plugin interface in the WordPress admin dashboard
2. The attacker crafts a malicious payload containing JavaScript code within the message parameter
3. Upon submission, the malicious script is stored in the WordPress database without proper sanitization
4. When any user (administrator, editor, subscriber, or unauthenticated visitor) views a page containing the injected voice mail message, the malicious script executes in their browser context
5. The attacker can then capture session cookies, redirect users to phishing pages, modify page content, or perform actions on behalf of the victim

The stored nature of this XSS vulnerability means the malicious payload persists until manually removed, potentially affecting many users over an extended period. Technical details and vulnerable code paths can be reviewed at the Wordfence Vulnerability Analysis.

Detection Methods for CVE-2026-1164

Indicators of Compromise

• Unusual JavaScript code patterns stored in database entries related to the Easy Voice Mail plugin
• Unexpected <script> tags or event handlers (e.g., onerror, onload) in voice mail message content
• Reports of unexpected redirects or pop-ups when viewing pages with voice mail functionality
• Anomalous administrator activity in WordPress access logs, particularly around the Easy Voice Mail plugin settings

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block XSS payloads in form submissions
• Implement Content Security Policy (CSP) headers to prevent inline script execution and detect policy violations
• Use WordPress security plugins such as Wordfence to scan for known vulnerabilities and suspicious code patterns
• Monitor WordPress database tables associated with the Easy Voice Mail plugin for suspicious content

Monitoring Recommendations

• Enable WordPress audit logging to track administrator actions, especially plugin configuration changes
• Configure browser CSP reporting to receive alerts when inline scripts attempt execution
• Regularly scan WordPress installations for outdated or vulnerable plugins using automated security tools
• Review server access logs for unusual patterns targeting WordPress admin endpoints

How to Mitigate CVE-2026-1164

Immediate Actions Required

• Update the Easy Voice Mail plugin to a version newer than 1.2.5 if a patched version is available
• If no patch is available, consider temporarily deactivating the Easy Voice Mail plugin until a fix is released
• Review existing voice mail entries in the database for suspicious content and remove any malicious payloads
• Implement Content Security Policy headers to mitigate the impact of any successful XSS attacks
• Restrict Administrator access to trusted users only

Patch Information

Organizations should monitor the WordPress plugin repository for updated versions of the Easy Voice Mail plugin that address this vulnerability. Check the Wordfence Vulnerability Analysis for the latest remediation guidance and patch availability information.

Workarounds

• Temporarily disable or uninstall the Easy Voice Mail plugin until a patched version is available
• Implement strict Content Security Policy headers to prevent inline script execution site-wide
• Use a Web Application Firewall (WAF) with XSS protection rules enabled to filter malicious input
• Limit Administrator account access and audit existing administrator users for suspicious activity

# WordPress Content Security Policy implementation via .htaccess
# Add to .htaccess in WordPress root directory
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"
</IfModule>