CVE-2025-48304: Google XML News Sitemap CSRF Vulnerability

CVE-2025-48304 Overview

CVE-2025-48304 is a Cross-Site Request Forgery (CSRF) vulnerability in the Google XML News Sitemap WordPress plugin (gn-xml-sitemap) developed by Gary Illyes. This vulnerability allows attackers to chain CSRF with Stored Cross-Site Scripting (XSS), enabling malicious scripts to be persistently injected into the affected WordPress site. An attacker can trick an authenticated administrator into clicking a malicious link, which then executes actions on the WordPress site without the administrator's consent, ultimately leading to stored XSS payloads being embedded in the site.

Critical Impact

This CSRF-to-Stored-XSS chain allows attackers to persistently compromise WordPress sites, potentially leading to administrator session hijacking, malicious redirect injection, and complete site takeover.

Affected Products

• Google XML News Sitemap plugin (gn-xml-sitemap) version 0.02 and earlier
• WordPress installations using the affected plugin versions
• Sites where administrators have active sessions while browsing untrusted content

Discovery Timeline

• 2025-08-28 - CVE-2025-48304 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-48304

Vulnerability Analysis

This vulnerability combines two distinct attack vectors into a powerful exploitation chain. The Google XML News Sitemap plugin lacks proper CSRF token validation on its administrative forms, allowing attackers to forge requests that modify plugin settings. When exploited, these forged requests can inject malicious JavaScript payloads that are stored in the plugin's configuration and subsequently rendered without proper output encoding.

The attack requires user interaction—specifically, an authenticated WordPress administrator must be tricked into visiting a malicious page or clicking a crafted link while logged into their WordPress dashboard. Once triggered, the malicious payload persists in the database and executes whenever the affected page or administrative interface is loaded.

Root Cause

The root cause of CVE-2025-48304 is the absence of proper CSRF protection mechanisms (nonce verification) in the plugin's administrative form handlers. WordPress provides built-in functions such as wp_nonce_field() and check_admin_referer() to prevent CSRF attacks, but these security controls were not implemented in the affected plugin versions. Additionally, user-supplied input is not properly sanitized before storage, and output encoding is missing when displaying stored values, enabling the Stored XSS component of the attack chain.

Attack Vector

The attack is executed over the network and requires user interaction. An attacker crafts a malicious HTML page containing a hidden form that targets the vulnerable plugin's administrative endpoint. When an authenticated WordPress administrator visits this page, the form automatically submits, modifying plugin settings to include malicious JavaScript.

The attack flow proceeds as follows: First, the attacker creates a malicious page hosting a CSRF payload targeting the plugin's settings. Then, the attacker lures an authenticated WordPress administrator to visit this page. The CSRF payload executes silently, injecting stored XSS into plugin settings. Finally, the malicious script executes whenever the compromised settings page is accessed, potentially stealing session cookies, creating rogue admin accounts, or redirecting visitors to malicious sites.

For detailed technical information about this vulnerability, refer to the Patchstack WordPress Plugin Vulnerability advisory.

Detection Methods for CVE-2025-48304

Indicators of Compromise

• Unexpected changes to Google XML News Sitemap plugin settings, particularly fields containing JavaScript or HTML tags
• Suspicious script tags or event handlers stored in plugin configuration values in the wp_options database table
• Unexpected administrative actions occurring without user initiation, such as new admin user creation or plugin installations
• Browser developer console errors indicating blocked XSS attempts by Content Security Policy

Detection Strategies

• Monitor WordPress audit logs for configuration changes to the gn-xml-sitemap plugin settings without corresponding admin activity
• Implement file integrity monitoring on WordPress configuration files and database option values
• Deploy web application firewall (WAF) rules to detect and block CSRF attacks targeting WordPress administrative endpoints
• Regularly scan plugin settings and database entries for malicious JavaScript patterns such as <script>, javascript:, and event handlers like onerror

Monitoring Recommendations

• Enable WordPress activity logging plugins to capture all administrative actions with timestamps and source IP addresses
• Configure SentinelOne to monitor for suspicious web shell creation or unauthorized file modifications in the WordPress directory
• Set up alerts for new administrator account creation and plugin configuration changes
• Monitor outbound network connections from the web server for data exfiltration attempts

How to Mitigate CVE-2025-48304

Immediate Actions Required

• Remove or deactivate the Google XML News Sitemap plugin (gn-xml-sitemap) immediately if running version 0.02 or earlier
• Audit plugin settings for any suspicious content, particularly JavaScript code or HTML injection
• Review WordPress admin user accounts for any unauthorized additions
• Clear browser caches and WordPress object caches to remove any cached malicious content
• Consider using alternative sitemap plugins that are actively maintained and security audited

Patch Information

As of the last update, no official patch has been released for this vulnerability. The affected plugin version 0.02 and earlier remain vulnerable. Website administrators should consider this plugin abandoned and migrate to a maintained alternative. For the latest information, check the Patchstack WordPress Plugin Vulnerability advisory.

Workarounds

• Deactivate and delete the vulnerable plugin until a security patch is available
• Implement a Web Application Firewall (WAF) with CSRF and XSS protection rules
• Add Content Security Policy headers to mitigate the impact of potential XSS execution
• Restrict access to WordPress admin areas by IP address or VPN
• Use browser extensions that warn against or block CSRF attacks when browsing untrusted sites while authenticated to WordPress

# WordPress CLI command to deactivate the vulnerable plugin
wp plugin deactivate gn-xml-sitemap --path=/var/www/html/wordpress

# Check if the plugin is installed and get version info
wp plugin list --path=/var/www/html/wordpress | grep gn-xml-sitemap

# Optional: Remove the plugin entirely
wp plugin delete gn-xml-sitemap --path=/var/www/html/wordpress

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