CVE-2025-23746: CMC MIGRATE Reflected XSS Vulnerability

CVE-2025-23746 Overview

CVE-2025-23746 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the CMC MIGRATE WordPress plugin developed by Edem. The vulnerability stems from improper neutralization of input during web page generation (CWE-79), allowing attackers to inject malicious scripts that execute in the context of a victim's browser session.

This reflected XSS flaw enables attackers to craft malicious URLs containing JavaScript payloads. When an authenticated user clicks such a link, the malicious script executes within their browser, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim.

Critical Impact

Attackers can exploit this reflected XSS vulnerability to steal session cookies, redirect users to malicious sites, or perform actions as the authenticated victim within the WordPress admin interface.

Affected Products

• CMC MIGRATE WordPress Plugin versions through 0.0.3
• WordPress installations with the cmc-migrate plugin installed and active

Discovery Timeline

• 2025-01-22 - CVE-2025-23746 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2025-23746

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), which encompasses Cross-Site Scripting attacks. The CMC MIGRATE plugin fails to properly sanitize user-supplied input before reflecting it back in HTTP responses, creating an exploitable condition for reflected XSS attacks.

In reflected XSS scenarios, the malicious payload is embedded in a request—typically via a URL parameter or form input—and immediately reflected back in the server's response without adequate encoding or validation. The victim's browser then interprets the injected content as legitimate code, executing the attacker's script within the trusted context of the vulnerable WordPress site.

The impact of this vulnerability includes the potential for unauthorized access to WordPress administrative functions if an administrator is targeted, defacement of the WordPress site through DOM manipulation, theft of sensitive information including authentication tokens and session identifiers, and distribution of malware through the compromised page.

Root Cause

The root cause of CVE-2025-23746 lies in the CMC MIGRATE plugin's failure to implement proper input validation and output encoding for user-controlled data. WordPress provides several sanitization functions such as esc_html(), esc_attr(), and wp_kses() that should be used when handling user input, but the vulnerable code paths in the plugin appear to bypass these security controls.

Attack Vector

The attack requires social engineering to trick a victim into clicking a malicious link containing the XSS payload. The attacker constructs a URL targeting the vulnerable CMC MIGRATE plugin endpoint with JavaScript code embedded in a parameter. When the victim—ideally a WordPress administrator—clicks the link, the server reflects the unsanitized payload back in the response, and the victim's browser executes the malicious script.

For technical details on exploitation, refer to the Patchstack Security Advisory.

Detection Methods for CVE-2025-23746

Indicators of Compromise

• Unusual URL parameters containing JavaScript or HTML tags in requests to the CMC MIGRATE plugin endpoints
• Access logs showing encoded script tags such as %3Cscript%3E in query strings targeting the plugin
• User reports of unexpected browser behavior or redirects when accessing WordPress admin pages
• Authentication tokens or session cookies being exfiltrated to external domains

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block common XSS payloads in request parameters
• Monitor server access logs for suspicious URL patterns containing encoded special characters
• Deploy Content Security Policy (CSP) headers to restrict script execution sources
• Utilize browser-based XSS auditors and security extensions for additional client-side protection

Monitoring Recommendations

• Enable detailed logging for all requests to WordPress plugin endpoints
• Configure alerting for requests containing script tags or JavaScript event handlers
• Monitor for outbound connections to unknown domains that may indicate data exfiltration
• Review WordPress admin activity logs for any unauthorized configuration changes

How to Mitigate CVE-2025-23746

Immediate Actions Required

• Deactivate and remove the CMC MIGRATE plugin (cmc-migrate) if it is not essential for operations
• Review WordPress access logs for any evidence of exploitation attempts
• Implement Web Application Firewall rules to filter XSS payloads targeting this plugin
• Educate administrators about the risks of clicking untrusted links while logged into WordPress

Patch Information

As of the CVE publication date, versions through 0.0.3 of the CMC MIGRATE plugin are confirmed vulnerable. Check the Patchstack advisory for updates on patched versions. If no patch is available, consider removing the plugin entirely and seeking alternative solutions for migration functionality.

Workarounds

• Remove or deactivate the CMC MIGRATE plugin until a patched version is released
• Implement strict Content Security Policy headers to mitigate XSS impact: Content-Security-Policy: script-src 'self';
• Use a Web Application Firewall with XSS protection rules enabled
• Restrict access to WordPress admin areas by IP address where feasible
• Train users to verify URLs before clicking and to be suspicious of links received via email or messaging

# WordPress configuration to add security headers via .htaccess
# Add to .htaccess in WordPress root directory
<IfModule mod_headers.c>
    Header set X-XSS-Protection "1; mode=block"
    Header set X-Content-Type-Options "nosniff"
    Header set Content-Security-Policy "script-src 'self' 'unsafe-inline' 'unsafe-eval'; object-src 'none';"
</IfModule>