CVE-2025-47554: CSS3 Pricing Tables WordPress XSS Flaw

CVE-2025-47554 Overview

A Reflected Cross-Site Scripting (XSS) vulnerability has been identified in the CSS3 Compare Pricing Tables for WordPress plugin developed by QuanticaLabs. This vulnerability allows attackers to inject malicious scripts into web pages viewed by other users through improper neutralization of user-supplied input during web page generation.

Critical Impact

Attackers can execute arbitrary JavaScript code in the context of a victim's browser session, potentially leading to session hijacking, credential theft, or delivery of malicious payloads to site visitors.

Affected Products

• CSS3 Compare Pricing Tables for WordPress plugin version 11.6 and earlier
• WordPress sites utilizing the css3_web_pricing_tables_grids plugin
• All installations of the affected plugin versions regardless of WordPress version

Discovery Timeline

• 2025-07-16 - CVE-2025-47554 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-47554

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation). The CSS3 Compare Pricing Tables for WordPress plugin fails to properly sanitize user-controlled input before reflecting it back in HTTP responses. This allows attackers to craft malicious URLs containing JavaScript payloads that execute when unsuspecting users click the link.

Reflected XSS attacks require social engineering to trick victims into clicking a crafted link. Once clicked, the malicious script executes with the same privileges as the authenticated user, potentially allowing the attacker to perform actions on behalf of the victim, steal session cookies, or redirect users to phishing pages.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding within the plugin's request handling logic. User-supplied parameters are not properly sanitized before being included in the HTML response, allowing script tags and JavaScript event handlers to be injected and executed in the browser context.

Attack Vector

The attack vector for this Reflected XSS vulnerability involves crafting a malicious URL containing JavaScript code in vulnerable parameters. When a victim visits this URL (typically through a phishing email or malicious link), the injected script executes in their browser within the context of the affected WordPress site.

The attacker can leverage this to steal session cookies, capture keystrokes, redirect users to malicious sites, or perform unauthorized actions using the victim's authenticated session. Administrative users are particularly high-value targets as compromising their sessions could lead to full site takeover.

Detection Methods for CVE-2025-47554

Indicators of Compromise

• Unusual URL parameters containing encoded JavaScript, such as <script> tags or event handlers like onerror, onload, or onclick
• Web server logs showing requests with suspicious query strings targeting the CSS3 Compare Pricing Tables plugin endpoints
• Reports from users about unexpected redirects or browser behavior when interacting with pricing table pages
• Browser security console warnings about inline script execution from untrusted sources

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payloads in URL parameters
• Monitor server access logs for requests containing encoded script tags or JavaScript event handlers
• Deploy browser-based content security policy (CSP) violations monitoring
• Utilize security scanning tools that specifically check for reflected XSS vulnerabilities in WordPress plugins

Monitoring Recommendations

• Enable verbose logging for the WordPress site to capture detailed request parameters
• Configure security information and event management (SIEM) alerts for XSS attack patterns
• Regularly scan the WordPress installation using vulnerability scanners that include the Patchstack database
• Monitor for unusual outbound connections from client browsers that may indicate script injection

How to Mitigate CVE-2025-47554

Immediate Actions Required

• Update the CSS3 Compare Pricing Tables for WordPress plugin to a patched version if available from QuanticaLabs
• If no patch is available, consider temporarily deactivating the plugin until a fix is released
• Implement a Web Application Firewall (WAF) with XSS protection rules
• Review and audit any custom implementations or modifications to the plugin

Patch Information

According to the Patchstack WordPress Vulnerability Advisory, this vulnerability affects CSS3 Compare Pricing Tables for WordPress version 11.6 and earlier. Website administrators should check with QuanticaLabs for available security updates and apply them immediately upon release.

Workarounds

• Implement Content Security Policy (CSP) headers to restrict inline script execution and mitigate XSS impact
• Deploy a WAF rule to filter out requests containing common XSS payloads targeting the plugin's endpoints
• Limit access to the WordPress admin dashboard to trusted IP addresses to reduce the attack surface for session hijacking
• Consider using WordPress security plugins that provide real-time XSS protection and virtual patching capabilities

# Example: Adding Content Security Policy header in .htaccess
# Add to your WordPress .htaccess file
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';"
</IfModule>