CVE-2025-49945: Shortcode Generator XSS Vulnerability

CVE-2025-49945 Overview

A Reflected Cross-Site Scripting (XSS) vulnerability has been identified in the Shortcode Generator plugin by kylegetson for WordPress. This vulnerability arises from improper neutralization of user-supplied input during web page generation, allowing attackers to inject malicious scripts that execute in the context of a victim's browser session. The vulnerability affects all versions of the Shortcode Generator plugin through version 1.1.

Critical Impact

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

Affected Products

• Shortcode Generator WordPress Plugin version 1.1 and earlier
• WordPress installations using the vulnerable shortcode-generator plugin

Discovery Timeline

• 2025-10-22 - CVE-2025-49945 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-49945

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Shortcode Generator plugin fails to properly sanitize and escape user-controlled input before reflecting it back in the HTML response. This allows attackers to craft malicious URLs containing JavaScript payloads that execute when a victim clicks the link.

The attack is network-accessible and requires user interaction—specifically, the victim must click a malicious link or visit a compromised page. When successful, the attack can impact resources beyond the vulnerable site's origin due to the changed scope characteristic of this vulnerability.

Root Cause

The root cause lies in insufficient input validation and output encoding within the plugin's shortcode handling functionality. User-supplied parameters are directly incorporated into the page output without proper escaping, enabling the injection of arbitrary HTML and JavaScript content.

Attack Vector

The attack vector is network-based, requiring an attacker to craft a specially formatted URL containing a malicious JavaScript payload. This URL is then distributed to potential victims through phishing emails, social media, or other means. When a user clicks the link while authenticated to the WordPress site, the injected script executes with the user's session privileges.

For reflected XSS attacks like this one, the malicious payload is embedded in the URL query parameters and reflected back in the server's response. The lack of proper input sanitization in the Shortcode Generator plugin allows script tags and event handlers to be injected and executed. Technical details can be found in the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-49945

Indicators of Compromise

• Suspicious URL parameters containing encoded JavaScript or HTML tags targeting the Shortcode Generator plugin
• Web server logs showing requests with script, onerror, onload, or similar event handlers in query strings
• User reports of unexpected redirects or pop-ups when interacting with shortcode-related functionality

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payloads in URL parameters
• Monitor HTTP request logs for suspicious patterns including encoded script tags and event handlers
• Deploy browser-based security solutions that can detect and prevent XSS execution
• Review WordPress plugin audit logs for unusual activity related to the Shortcode Generator plugin

Monitoring Recommendations

• Enable verbose logging for WordPress and review access logs regularly for exploitation attempts
• Configure Content Security Policy (CSP) headers to restrict script execution sources
• Set up alerting for repeated requests containing known XSS payload patterns

How to Mitigate CVE-2025-49945

Immediate Actions Required

• Deactivate and remove the Shortcode Generator plugin if not essential to site functionality
• Implement a Web Application Firewall with XSS protection rules
• Review user sessions and invalidate any potentially compromised sessions
• Audit administrative accounts for unauthorized changes

Patch Information

As of the last NVD update on 2026-04-15, users should consult the Patchstack WordPress Vulnerability Report for the latest patch availability and remediation guidance from the plugin developer. Users running Shortcode Generator version 1.1 or earlier should check for plugin updates or consider alternative shortcode management solutions.

Workarounds

• Remove or deactivate the Shortcode Generator plugin until a patched version is available
• Implement strict Content Security Policy headers to mitigate script injection attacks
• Use server-side input validation to filter potentially dangerous characters from URL parameters
• Deploy a Web Application Firewall configured to block XSS attack patterns

# WordPress CLI command to deactivate the vulnerable plugin
wp plugin deactivate shortcode-generator

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