CVE-2026-24539: ABCdatos RGPD Auth Bypass Vulnerability

CVE-2026-24539 Overview

CVE-2026-24539 is a Missing Authorization vulnerability affecting the ABCdatos Protección de datos – RGPD WordPress plugin. This broken access control flaw allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized access to sensitive functionality or data without proper authentication checks.

The vulnerability stems from a lack of proper authorization validation (CWE-862), allowing unauthenticated or low-privileged users to access resources or perform actions that should require higher privileges. Given that this plugin is designed for GDPR (General Data Protection Regulation) compliance and data protection, unauthorized access could have significant implications for user privacy and regulatory compliance.

Critical Impact

Attackers can bypass access controls to access protected resources without authorization, potentially compromising GDPR-related data and functionality.

Affected Products

• ABCdatos Protección de datos – RGPD plugin version 0.68 and earlier
• WordPress installations using the proteccion-datos-rgpd plugin

Discovery Timeline

• 2026-01-23 - CVE-2026-24539 published to NVD
• 2026-01-27 - Last updated in NVD database

Technical Details for CVE-2026-24539

Vulnerability Analysis

This vulnerability is classified as Missing Authorization (CWE-862), a common weakness where software fails to perform authorization checks when an actor attempts to access a resource or perform an action. In the context of this WordPress plugin, the application does not properly verify that users have the required permissions before granting access to protected functionality.

The network-accessible nature of this vulnerability means that an attacker can remotely exploit the misconfigured access controls without any user interaction. The flaw allows unauthorized information disclosure, though it does not appear to allow modification of data or denial of service based on the impact assessment.

Root Cause

The root cause of this vulnerability is insufficient authorization checking within the plugin's codebase. The plugin fails to implement proper capability checks or nonce verification on certain actions, allowing attackers to bypass security controls that should restrict access to authenticated and authorized users only.

WordPress plugins are expected to use functions like current_user_can() to verify user capabilities and wp_verify_nonce() to validate request authenticity. When these checks are missing or improperly implemented, broken access control vulnerabilities like this one emerge.

Attack Vector

The attack can be executed remotely over the network without requiring any privileges or user interaction. An attacker could directly access vulnerable endpoints or functionality exposed by the plugin, bypassing the intended access control mechanisms.

The exploitation typically involves:

1. Identifying the vulnerable plugin endpoints or AJAX actions
2. Crafting requests that target functionality lacking proper authorization checks
3. Accessing or exfiltrating data that should be restricted to authorized users

Since no verified exploit code examples are available, refer to the Patchstack Vulnerability Report for detailed technical analysis of the vulnerability mechanism.

Detection Methods for CVE-2026-24539

Indicators of Compromise

• Unusual access patterns to RGPD plugin-related endpoints from unauthenticated sessions
• Unexpected requests to plugin AJAX handlers without proper authentication cookies
• Access logs showing requests to proteccion-datos-rgpd plugin paths from external IP addresses without corresponding login events

Detection Strategies

• Review WordPress access logs for requests to /wp-admin/admin-ajax.php with actions related to the RGPD plugin from unauthenticated users
• Monitor for enumeration attempts targeting plugin functionality
• Implement Web Application Firewall (WAF) rules to detect and block suspicious requests to the vulnerable plugin endpoints

Monitoring Recommendations

• Enable verbose logging for WordPress AJAX requests and plugin activity
• Configure alerts for access attempts to GDPR-related data endpoints without valid authentication
• Regularly audit plugin access logs for anomalous request patterns

How to Mitigate CVE-2026-24539

Immediate Actions Required

• Audit current plugin usage and assess exposure to unauthenticated access
• Consider temporarily disabling the proteccion-datos-rgpd plugin until a patched version is available
• Implement additional access controls at the web server or WAF level to restrict access to vulnerable endpoints
• Review any sensitive GDPR-related data that may have been accessed without authorization

Patch Information

No official patch information is currently available from the vendor. Users should monitor the Patchstack Vulnerability Report and the WordPress plugin repository for security updates to version 0.68 or newer releases that address this vulnerability.

Workarounds

• Disable or deactivate the plugin until a security patch is released
• Implement IP-based access restrictions for WordPress admin functionality
• Use a WordPress security plugin to add additional access control layers
• Consider implementing server-level authentication for sensitive plugin endpoints

# Example: Restrict access to plugin directory via .htaccess
# Add to /wp-content/plugins/proteccion-datos-rgpd/.htaccess

<Files "*.php">
  Order Deny,Allow
  Deny from all
  Allow from 127.0.0.1
</Files>