CVE-2025-24608: GD Mail Queue Reflected XSS Vulnerability

CVE-2025-24608 Overview

CVE-2025-24608 is a Reflected Cross-Site Scripting (XSS) vulnerability in the GD Mail Queue WordPress plugin developed by Milan Petrovic. This vulnerability allows attackers to inject malicious scripts into web pages viewed by other users through improper neutralization of input during web page generation.

Critical Impact

Attackers can execute arbitrary JavaScript in victim browsers, potentially stealing session cookies, performing actions on behalf of authenticated users, or redirecting users to malicious websites.

Affected Products

• GD Mail Queue WordPress Plugin versions up to and including 4.3
• WordPress installations with the gd-mail-queue plugin enabled
• All users accessing affected WordPress admin interfaces

Discovery Timeline

• 2025-01-31 - CVE-2025-24608 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-24608

Vulnerability Analysis

This Reflected XSS vulnerability (CWE-79) occurs when the GD Mail Queue plugin fails to properly sanitize user-supplied input before rendering it in web page output. When a victim clicks a maliciously crafted link or visits a compromised page, the injected script executes within the context of the vulnerable WordPress site.

The vulnerability requires user interaction, as the victim must click a specially crafted link or be redirected to a malicious URL containing the XSS payload. Once triggered, the malicious script runs with the same privileges as the victim user, which is particularly dangerous when targeting WordPress administrators.

Root Cause

The root cause is improper input validation and output encoding within the GD Mail Queue plugin. The application fails to neutralize special characters in user-controllable input before including it in dynamically generated web pages. This allows attackers to inject HTML and JavaScript code that the browser interprets as part of the legitimate page content.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker crafts a malicious URL containing JavaScript payload targeting the vulnerable plugin endpoint. The attacker then distributes this URL through phishing emails, social media, or by embedding it in compromised websites. When a victim (particularly a WordPress administrator) clicks the link, the malicious script executes in their browser session.

The vulnerability can be exploited to:

• Steal session cookies and authentication tokens
• Perform unauthorized actions as the victim user
• Modify page content to display phishing forms
• Redirect users to malicious external sites

Detection Methods for CVE-2025-24608

Indicators of Compromise

• Suspicious URL parameters in web server logs containing encoded JavaScript or HTML tags targeting gd-mail-queue plugin endpoints
• Unexpected browser redirections or pop-ups when accessing the WordPress admin panel
• Reports from users of unusual behavior when interacting with mail queue functionality
• Web Application Firewall logs showing blocked XSS patterns targeting the affected plugin

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common XSS payloads in request parameters
• Implement Content Security Policy (CSP) headers to restrict inline script execution
• Monitor web server access logs for suspicious URL-encoded payloads targeting plugin endpoints
• Use browser-based XSS detection tools during security assessments

Monitoring Recommendations

• Enable detailed logging on WordPress installations to capture all requests to plugin endpoints
• Configure alerting for unusual patterns in URL parameters, particularly those containing script tags or event handlers
• Regularly review access logs for evidence of XSS exploitation attempts
• Implement real-time monitoring of WordPress admin user sessions for anomalous behavior

How to Mitigate CVE-2025-24608

Immediate Actions Required

• Update the GD Mail Queue plugin to the latest patched version as soon as available
• Review WordPress user sessions and revoke any suspicious active sessions
• Implement Content Security Policy headers to mitigate XSS impact
• Consider temporarily disabling the plugin if a patch is not yet available and the functionality is not critical

Patch Information

Check the Patchstack Vulnerability Report for the latest patch information and remediation guidance. Update the GD Mail Queue plugin through the WordPress admin dashboard once a patched version is released by the developer.

Workarounds

• Implement a Web Application Firewall (WAF) with XSS protection rules to filter malicious requests
• Restrict access to WordPress admin areas to trusted IP addresses only
• Educate administrators not to click suspicious links, especially when logged into WordPress
• Deploy browser security extensions that help detect and block XSS attacks

# WordPress CLI command to check installed plugin version
wp plugin list --name=gd-mail-queue --format=table

# Verify plugin status and consider disabling temporarily
wp plugin deactivate gd-mail-queue

# Add Content-Security-Policy header in .htaccess (Apache)
# Header set Content-Security-Policy "default-src 'self'; script-src 'self'"