CVE-2026-24577: Pie Register Auth Bypass Vulnerability

CVE-2026-24577 Overview

CVE-2026-24577 is a Missing Authorization vulnerability discovered in the Pie Register plugin for WordPress developed by Genetech Products. This vulnerability allows attackers to exploit incorrectly configured access control security levels, potentially gaining unauthorized access to protected functionality within WordPress sites using the affected plugin.

The Pie Register plugin is a popular WordPress registration form builder that enables site administrators to create custom registration and login forms. Due to improper authorization checks, unauthenticated attackers may be able to access restricted endpoints or functionality that should require proper authentication or elevated privileges.

Critical Impact

Unauthenticated attackers can exploit broken access control to bypass security restrictions and potentially access sensitive user registration data or administrative functions in WordPress sites running vulnerable versions of Pie Register.

Affected Products

• Pie Register WordPress Plugin versions up to and including 3.8.4.7
• WordPress sites utilizing the Pie Register plugin for user registration
• All installations of Pie Register from initial release through version 3.8.4.7

Discovery Timeline

• 2026-01-23 - CVE CVE-2026-24577 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2026-24577

Vulnerability Analysis

This vulnerability is classified as CWE-862: Missing Authorization, which occurs when a software application does not perform an authorization check when an actor attempts to access a resource or perform an action. In the context of the Pie Register WordPress plugin, certain functionality lacks proper permission validation, allowing unauthorized users to interact with features that should be restricted.

The vulnerability enables network-based attacks without requiring authentication or user interaction. An attacker can remotely access the vulnerable endpoints and potentially retrieve sensitive information such as user registration data, form configurations, or other protected content managed by the plugin.

Root Cause

The root cause of CVE-2026-24577 is the absence of proper authorization checks within the Pie Register plugin's codebase. WordPress plugins typically need to implement capability checks using functions like current_user_can() to verify that the requesting user has appropriate permissions before executing sensitive operations.

In vulnerable versions of Pie Register (through 3.8.4.7), certain AJAX handlers or REST API endpoints fail to validate user capabilities, allowing any user—including unauthenticated visitors—to invoke functionality intended only for authenticated users or administrators.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP requests targeting the vulnerable endpoints exposed by the Pie Register plugin.

The exploitation process typically involves:

1. Identifying a WordPress site running a vulnerable version of Pie Register
2. Discovering the unprotected endpoints or AJAX actions exposed by the plugin
3. Crafting requests to access restricted functionality without proper authorization
4. Extracting sensitive information or manipulating plugin settings

The vulnerability allows for information disclosure, as the access control bypass enables reading of data that should be protected. For detailed technical analysis, refer to the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-24577

Indicators of Compromise

• Unusual HTTP requests to Pie Register AJAX handlers from unauthenticated sessions
• Unexpected access patterns to wp-admin/admin-ajax.php with Pie Register-specific actions
• Anomalous data retrieval activities involving user registration information
• Server logs showing repeated requests to plugin endpoints without valid authentication cookies

Detection Strategies

• Monitor WordPress AJAX endpoint access logs for suspicious Pie Register action parameters
• Implement Web Application Firewall (WAF) rules to detect unauthorized access attempts to plugin-specific endpoints
• Deploy SentinelOne Singularity Platform for real-time behavioral analysis and threat detection
• Audit authentication logs for access patterns indicating authorization bypass attempts

Monitoring Recommendations

• Enable comprehensive logging for all WordPress AJAX requests and REST API calls
• Set up alerts for high-volume requests targeting Pie Register plugin endpoints
• Monitor for data exfiltration indicators such as unusually large responses from plugin endpoints
• Review user registration logs for anomalous entries that may indicate unauthorized access

How to Mitigate CVE-2026-24577

Immediate Actions Required

• Update the Pie Register plugin to the latest patched version immediately
• Review WordPress access logs for signs of exploitation attempts
• Temporarily disable the Pie Register plugin if an update is not yet available
• Implement WAF rules to block unauthorized access to affected endpoints
• Audit user registration data for any signs of unauthorized access or data leakage

Patch Information

Site administrators should update the Pie Register plugin to a version newer than 3.8.4.7 through the WordPress plugin repository. The vendor has addressed this broken access control vulnerability by implementing proper authorization checks on affected endpoints. For complete remediation details, consult the Patchstack Vulnerability Report.

Workarounds

• Restrict access to wp-admin/admin-ajax.php using server-level access controls for untrusted IPs
• Implement a Web Application Firewall with rules blocking unauthenticated requests to Pie Register endpoints
• Temporarily disable user registration functionality if the plugin cannot be immediately updated
• Use WordPress security plugins to add additional capability checks to AJAX handlers

# Configuration example - Apache .htaccess rule to restrict AJAX access
<Files admin-ajax.php>
    Order Deny,Allow
    Deny from all
    # Allow only authenticated admin requests (adjust IP as needed)
    Allow from 127.0.0.1
    Allow from your-trusted-ip
</Files>