CVE-2026-24944: Subscribe2 Auth Bypass Vulnerability

CVE-2026-24944 Overview

A Missing Authorization vulnerability has been identified in the weDevs Subscribe2 WordPress plugin. This security flaw allows attackers to exploit incorrectly configured access control security levels, potentially gaining unauthorized access to protected functionality. The vulnerability stems from insufficient authorization checks (CWE-862) within the plugin's codebase.

Critical Impact

Attackers can bypass access control mechanisms to access protected functionality without proper authorization, potentially exposing sensitive subscriber data and enabling unauthorized modifications to plugin settings.

Affected Products

• Subscribe2 WordPress Plugin versions through 10.44
• WordPress installations running vulnerable Subscribe2 versions
• Sites using weDevs Subscribe2 for newsletter subscription management

Discovery Timeline

• 2026-02-20 - CVE-2026-24944 published to NVD
• 2026-02-20 - Last updated in NVD database

Technical Details for CVE-2026-24944

Vulnerability Analysis

This vulnerability represents a Broken Access Control flaw in the Subscribe2 WordPress plugin developed by weDevs. The core issue lies in missing authorization checks that should validate whether a user has appropriate permissions before allowing access to certain plugin functionality.

In WordPress plugins, proper authorization typically involves checking user capabilities using functions like current_user_can() before executing privileged operations. When these checks are absent or improperly implemented, attackers can potentially access administrative functions or sensitive data without having the required permissions.

The vulnerability requires network access and involves some complexity in exploitation (reflected in the High attack complexity requirement), but does not require authentication or user interaction to exploit. Successful exploitation could lead to high confidentiality impact and low integrity impact on the affected WordPress installation.

Root Cause

The root cause is classified as CWE-862 (Missing Authorization). This weakness occurs when the software does not perform an authorization check when an actor attempts to access a resource or perform an action. In the context of WordPress plugins, this typically manifests as:

• Missing capability checks on AJAX handlers
• Unprotected REST API endpoints
• Administrative functions accessible without role verification
• Missing nonce verification combined with missing capability checks

Attack Vector

The attack vector is network-based, meaning an attacker can exploit this vulnerability remotely over the network without requiring local access to the target system. The exploitation scenario involves:

1. An attacker identifies unprotected endpoints or functions within the Subscribe2 plugin
2. The attacker crafts requests to access these endpoints without proper authentication
3. Due to missing authorization checks, the plugin processes these requests as if they came from an authorized user
4. The attacker gains access to sensitive subscriber data or can modify plugin configurations

For detailed technical analysis, refer to the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2026-24944

Indicators of Compromise

• Unexpected access to Subscribe2 administrative settings by non-administrative users
• Unusual API requests to Subscribe2 plugin endpoints from unauthenticated sessions
• Modifications to subscriber lists or plugin settings without corresponding admin activity logs
• Anomalous HTTP requests targeting /wp-admin/admin-ajax.php with Subscribe2-related actions

Detection Strategies

• Monitor WordPress access logs for requests to Subscribe2 plugin endpoints without proper authentication headers
• Implement Web Application Firewall (WAF) rules to detect and block unauthorized access attempts to plugin administrative functions
• Review WordPress audit logs for changes to Subscribe2 settings that don't correlate with legitimate admin sessions
• Deploy endpoint detection and response (EDR) solutions to identify suspicious WordPress process behavior

Monitoring Recommendations

• Enable comprehensive logging for all WordPress AJAX and REST API requests
• Configure alerting for failed authorization attempts within WordPress plugins
• Implement user behavior analytics to detect access patterns inconsistent with normal plugin usage
• Regularly audit Subscribe2 plugin configurations and subscriber data integrity

How to Mitigate CVE-2026-24944

Immediate Actions Required

• Update Subscribe2 plugin to a version newer than 10.44 when a patched version becomes available
• Review and restrict user roles and capabilities within WordPress to minimize potential impact
• Implement additional access controls at the web server level to protect administrative endpoints
• Consider temporarily disabling the Subscribe2 plugin if update is not immediately available and risk is unacceptable

Patch Information

A security patch addressing this vulnerability should be obtained from the plugin developer. Monitor the Patchstack vulnerability report for updated information regarding fixes. Website administrators should update to the latest available version of Subscribe2 that addresses this broken access control vulnerability.

Workarounds

• Implement server-level access restrictions to limit who can access WordPress administrative functions
• Use a WordPress security plugin with virtual patching capabilities to add authorization checks
• Configure .htaccess rules to restrict access to plugin directories from unauthorized IP addresses
• Enable WordPress two-factor authentication to add an additional security layer for administrative access

# Example .htaccess configuration to restrict admin-ajax.php access
<Files admin-ajax.php>
    <RequireAny>
        Require ip 192.168.1.0/24
        Require ip 10.0.0.0/8
    </RequireAny>
</Files>