CVE-2025-14845: NS IE Compatibility Fixer CSRF Vulnerability

CVE-2025-14845 Overview

The NS IE Compatibility Fixer plugin for WordPress is vulnerable to Cross-Site Request Forgery (CSRF) in all versions up to, and including, 2.1.5. This vulnerability exists due to missing nonce validation on the settings update functionality. This makes it possible for unauthenticated attackers to modify the plugin's settings via a forged request granted they can trick an administrator into performing an action such as clicking on a link.

Critical Impact

Unauthenticated attackers can modify plugin settings by exploiting missing CSRF protection, potentially compromising site configuration when administrators are deceived into clicking malicious links.

Affected Products

• NS IE Compatibility Fixer plugin for WordPress (versions up to and including 2.1.5)
• WordPress installations with affected plugin versions active

Discovery Timeline

• 2026-01-07 - CVE-2025-14845 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-14845

Vulnerability Analysis

This Cross-Site Request Forgery (CSRF) vulnerability (CWE-352) exists in the NS IE Compatibility Fixer WordPress plugin's settings update functionality. The vulnerability stems from the plugin's failure to implement proper nonce validation when processing administrative actions.

WordPress nonces are security tokens used to verify that a request originated from the legitimate user interface and was intentionally submitted by an authenticated user. Without this validation, the plugin cannot distinguish between legitimate settings changes made by an administrator and forged requests initiated by malicious actors.

An attacker can craft a malicious HTML page containing a hidden form that submits to the plugin's settings endpoint. When an authenticated administrator visits this page, their browser automatically includes their WordPress session cookies with the forged request, causing the settings change to be processed as if it were a legitimate action.

Root Cause

The root cause of this vulnerability is the absence of nonce validation in the settings update handler. Examining the vulnerable code in ns_admin_option_dashboard.php, the plugin processes form submissions without calling wp_verify_nonce() or check_admin_referer() to validate the request origin.

According to WordPress Nonces documentation, plugins should always verify nonces before processing any state-changing operations to prevent CSRF attacks.

Attack Vector

The attack requires network access and user interaction. An attacker must craft a malicious webpage or email containing an auto-submitting form that targets the vulnerable settings endpoint. The attack succeeds when:

1. The attacker identifies a WordPress site running NS IE Compatibility Fixer version 2.1.5 or earlier
2. The attacker crafts a malicious page with a forged form targeting the plugin's settings endpoint
3. A logged-in WordPress administrator visits the malicious page
4. The administrator's browser automatically submits the forged request with valid session credentials
5. The plugin processes the malicious request, modifying settings without authorization

The vulnerability allows modification of plugin settings but does not directly expose confidential information or cause system availability issues.

Detection Methods for CVE-2025-14845

Indicators of Compromise

• Unexpected changes to NS IE Compatibility Fixer plugin settings without administrator action
• Web server logs showing POST requests to plugin settings endpoints from external referrers
• Administrator reports of clicking suspicious links followed by configuration changes
• Audit logs indicating settings modifications without corresponding admin panel activity

Detection Strategies

• Monitor WordPress audit logs for settings changes to NS IE Compatibility Fixer plugin
• Implement web application firewall (WAF) rules to detect CSRF attack patterns
• Review HTTP referrer headers for settings update requests to identify external sources
• Configure alerting for administrative actions performed without proper user interface navigation

Monitoring Recommendations

• Enable comprehensive WordPress audit logging for all plugin configuration changes
• Deploy SentinelOne Singularity to monitor for suspicious web application behavior
• Configure real-time alerts for WordPress administrative actions from unexpected referrers
• Regularly review access logs for POST requests to /wp-admin/ endpoints from external domains

How to Mitigate CVE-2025-14845

Immediate Actions Required

• Update NS IE Compatibility Fixer plugin to the latest patched version as soon as available
• Disable the NS IE Compatibility Fixer plugin if it is not essential for site functionality
• Review and audit current plugin settings for any unauthorized modifications
• Educate WordPress administrators about phishing risks and suspicious link clicking
• Consider implementing additional CSRF protection at the web server or WAF level

Patch Information

At the time of publication, users should check the WordPress plugin repository for an updated version of NS IE Compatibility Fixer that addresses this CSRF vulnerability. The fix should implement proper nonce validation using WordPress security functions such as wp_verify_nonce() or check_admin_referer() as documented in the WordPress Admin Referer Check reference.

Monitor the Wordfence Vulnerability Report for updated patch information and remediation guidance.

Workarounds

• Temporarily deactivate the NS IE Compatibility Fixer plugin until a patch is available
• Implement a web application firewall (WAF) with CSRF protection rules
• Restrict access to WordPress admin panel by IP address where possible
• Use browser extensions that block cross-origin form submissions
• Ensure administrators use separate browser sessions for administrative tasks

# WordPress configuration to restrict admin access by IP
# Add to .htaccess in wp-admin directory
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_URI} ^/wp-admin
RewriteCond %{REMOTE_ADDR} !^192\.168\.1\.100$
RewriteRule ^(.*)$ - [F,L]
</IfModule>