CVE-2025-49064 Overview
CVE-2025-49064 is a Reflected Cross-Site Scripting (XSS) vulnerability in the Webilop User Language Switch WordPress plugin. The vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that execute in the context of a victim's browser session.
Critical Impact
Attackers can execute arbitrary JavaScript in victim browsers, potentially leading to session hijacking, credential theft, or unauthorized actions on behalf of authenticated users.
Affected Products
- Webilop User Language Switch plugin versions up to and including 1.6.10
- WordPress installations using the vulnerable plugin versions
Discovery Timeline
- 2025-08-14 - CVE-2025-49064 published to NVD
- 2026-04-23 - Last updated in NVD database
Technical Details for CVE-2025-49064
Vulnerability Analysis
This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation). The User Language Switch plugin fails to properly sanitize user-supplied input before reflecting it back in the HTTP response. When a victim clicks a specially crafted URL containing malicious JavaScript, the script executes within their browser session with full access to the page's DOM and cookies.
The attack requires user interaction—specifically, the victim must be tricked into clicking a malicious link. Once executed, the injected script operates within the same origin as the legitimate WordPress site, bypassing same-origin policy protections.
Root Cause
The root cause is insufficient input validation and output encoding within the User Language Switch plugin. User-controlled data is incorporated into the rendered HTML response without proper sanitization or escaping, allowing arbitrary script injection through crafted URL parameters.
Attack Vector
This is a network-based attack that requires user interaction. An attacker crafts a malicious URL containing JavaScript payloads in vulnerable parameters of the User Language Switch plugin. When a victim navigates to this URL, the malicious script reflects off the server and executes in the victim's browser.
Typical attack scenarios include:
- Phishing emails containing malicious links
- Social media posts with embedded malicious URLs
- Compromised websites redirecting to crafted URLs
- Forum or comment spam with weaponized links
Detection Methods for CVE-2025-49064
Indicators of Compromise
- Unusual URL patterns containing encoded script tags in plugin-related parameters
- Web server logs showing requests with JavaScript payloads in query strings
- Reports of suspicious redirects or pop-ups from users accessing the site
- Unexpected session activity or authentication anomalies following suspicious URL access
Detection Strategies
- Implement Web Application Firewall (WAF) rules to detect and block reflected XSS patterns
- Monitor web access logs for suspicious parameter values containing script elements
- Deploy browser-based XSS auditing and Content Security Policy (CSP) violation reporting
- Conduct regular vulnerability scans targeting WordPress plugins
Monitoring Recommendations
- Enable verbose logging for the WordPress installation and review for anomalous requests
- Configure Security Information and Event Management (SIEM) alerts for XSS attack signatures
- Implement Content Security Policy headers with reporting to capture policy violations
- Monitor for unusual outbound connections that may indicate data exfiltration following XSS exploitation
How to Mitigate CVE-2025-49064
Immediate Actions Required
- Update the User Language Switch plugin to a patched version if available
- Temporarily disable the User Language Switch plugin if no patch exists
- Implement WAF rules to block common XSS attack patterns targeting this plugin
- Review server logs for evidence of exploitation attempts
Patch Information
Refer to the Patchstack Vulnerability Report for the latest patch status and remediation guidance. Organizations should monitor the official plugin repository for security updates addressing this vulnerability.
Workarounds
- Disable the User Language Switch plugin until a patched version is available
- Implement strict Content Security Policy (CSP) headers to mitigate XSS impact
- Deploy a Web Application Firewall with XSS protection rules enabled
- Restrict plugin access to authenticated users only where feasible
# Example Content Security Policy header configuration for Apache
# Add to .htaccess or virtual host configuration
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; frame-ancestors 'self';"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
