CVE-2026-23541: Mail Mint Authorization Bypass Vulnerability

CVE-2026-23541 Overview

A Missing Authorization vulnerability (CWE-862) has been identified in the WPFunnels Mail Mint WordPress plugin. This vulnerability allows attackers to access functionality not properly constrained by Access Control Lists (ACLs), potentially enabling unauthorized users to perform privileged actions within the Mail Mint email marketing platform.

Critical Impact

Unauthorized access to Mail Mint plugin functionality could allow attackers to manipulate email marketing campaigns, access subscriber data, or modify plugin settings without proper authorization.

Affected Products

• Mail Mint WordPress Plugin version 1.19.4 and earlier
• WPFunnels Mail Mint (mail-mint) all versions through 1.19.4

Discovery Timeline

• 2026-02-19 - CVE CVE-2026-23541 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-23541

Vulnerability Analysis

This vulnerability stems from a Broken Access Control issue where the Mail Mint WordPress plugin fails to properly verify user authorization before executing certain functionality. The Missing Authorization flaw (CWE-862) occurs when the application does not perform adequate access control checks, allowing users to access resources or perform actions that should be restricted.

In WordPress plugins, this typically manifests when AJAX handlers or REST API endpoints lack proper capability checks using functions like current_user_can(). Without these authorization gates, any authenticated user—or in some cases unauthenticated users—can invoke sensitive administrative functions.

Root Cause

The root cause is the absence of proper authorization checks in the Mail Mint plugin's code paths. When a WordPress plugin implements functionality without verifying that the requesting user has the appropriate capabilities or permissions, it creates a Broken Access Control condition. This is classified under CWE-862 (Missing Authorization), indicating that the code does not properly restrict access to resources or actions based on user privileges.

Attack Vector

An attacker can exploit this vulnerability by directly calling unprotected plugin endpoints or AJAX actions. Since the plugin does not properly constrain functionality by ACLs, a lower-privileged user (such as a subscriber) or potentially an unauthenticated visitor could:

1. Identify vulnerable endpoints exposed by the Mail Mint plugin
2. Craft requests to those endpoints without requiring administrative privileges
3. Access or manipulate email marketing functionality, subscriber lists, or campaign data
4. Potentially escalate privileges within the plugin's scope

The vulnerability requires network access to the WordPress installation but does not require sophisticated techniques to exploit once identified.

Detection Methods for CVE-2026-23541

Indicators of Compromise

• Unexpected changes to Mail Mint plugin settings or configurations
• Unauthorized access to subscriber lists or email campaign data
• Suspicious AJAX requests to mail-mint endpoints from non-administrative users
• Unusual user activity patterns in WordPress logs related to the Mail Mint plugin

Detection Strategies

• Monitor WordPress access logs for requests to Mail Mint AJAX handlers from non-admin user sessions
• Implement Web Application Firewall (WAF) rules to detect unauthorized access attempts to plugin endpoints
• Review WordPress user activity logs for unexpected privilege usage or data access
• Deploy endpoint monitoring to track API calls to the Mail Mint plugin

Monitoring Recommendations

• Enable verbose logging for WordPress AJAX requests and review for suspicious patterns
• Configure alerts for any access to Mail Mint administrative functions by non-admin users
• Regularly audit user permissions and access patterns within the WordPress dashboard
• Implement SentinelOne Singularity XDR to detect anomalous behavior on WordPress hosting servers

How to Mitigate CVE-2026-23541

Immediate Actions Required

• Update Mail Mint plugin to a patched version beyond 1.19.4 when available
• Restrict WordPress user accounts to the minimum necessary privileges
• Implement additional access controls at the web server or WAF level
• Review and audit existing Mail Mint plugin configurations for unauthorized changes
• Consider temporarily disabling the Mail Mint plugin if a patch is not yet available and the risk is unacceptable

Patch Information

Check the Patchstack WordPress Vulnerability Report for the latest patch information and updates from the vendor. Users should upgrade to a version newer than 1.19.4 once a security patch is released by WPFunnels.

Workarounds

• Implement server-level access controls to restrict who can access WordPress AJAX endpoints
• Use a Web Application Firewall (WAF) to filter and monitor requests to the Mail Mint plugin
• Limit user registration and ensure only trusted users have accounts on the WordPress site
• Review and harden WordPress security configurations including disabling XML-RPC if not needed

# Configuration example - Restrict access to wp-admin AJAX for specific IPs (Apache)
# Add to .htaccess in WordPress root directory
<Files admin-ajax.php>
    Order deny,allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from YOUR_TRUSTED_IP
</Files>