CVE-2024-54256: Easy Blocks Pro Authorization Bypass Flaw

CVE-2024-54256 Overview

CVE-2024-54256 is a missing authorization vulnerability in the Seerox Easy Blocks Pro WordPress plugin. The flaw affects all versions from initial release through 1.0.21. Authenticated attackers with low-privilege accounts can access plugin functionality that lacks proper Access Control List (ACL) enforcement. The weakness maps to [CWE-862: Missing Authorization]. Exploitation requires network access and low privileges without user interaction.

Critical Impact
Authenticated attackers can invoke restricted plugin actions, modify data integrity, and cause high availability impact on affected WordPress sites.

Affected Products

Seerox Easy Blocks Pro plugin for WordPress
All versions from initial release through 1.0.21
WordPress sites with the easy-blocks-pro plugin installed and active

Discovery Timeline

2024-12-13 - CVE-2024-54256 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-54256

Vulnerability Analysis

The Easy Blocks Pro plugin exposes functionality without verifying whether the requesting user holds the appropriate capability. Missing authorization checks let low-privileged authenticated users invoke actions intended for administrators or higher-privileged roles. The result is a broken access control condition where the plugin trusts request context rather than validating user permissions.

An attacker with a subscriber-level account or similar low-privilege role can send requests directly to plugin endpoints. Because the endpoints do not enforce capability checks such as current_user_can(), the plugin processes the actions and modifies plugin state or site data. This produces integrity impact and can degrade site availability.

Root Cause

The root cause is the absence of capability verification on plugin action handlers, categorized as [CWE-862: Missing Authorization]. The plugin registers callable actions accessible to authenticated users but omits the authorization layer that restricts these actions to intended roles. Nonce checks alone, if present, do not substitute for role-based authorization in WordPress.

Attack Vector

Exploitation occurs over the network against the target WordPress instance. The attacker authenticates using any valid account, including self-registered subscriber accounts on sites that allow open registration. The attacker then issues HTTP requests to the vulnerable plugin endpoints, invoking actions that should be reserved for privileged administrators. No user interaction is required beyond the attacker's own session.

See the Patchstack Vulnerability Report for additional technical details on the affected endpoints.

Detection Methods for CVE-2024-54256

Indicators of Compromise

Unexpected changes to Easy Blocks Pro plugin configuration or block content authored by low-privileged users
WordPress admin-ajax.php or REST API requests targeting easy-blocks-pro endpoints from subscriber-level accounts
New or modified blocks, templates, or plugin options without corresponding administrator activity in the audit log

Detection Strategies

Audit WordPress access logs for POST requests to plugin-specific endpoints originating from non-administrator user IDs
Correlate authenticated session activity with plugin database changes in wp_options and plugin-owned tables
Deploy a WordPress security plugin or Web Application Firewall (WAF) rule to flag privilege-inconsistent plugin actions

Monitoring Recommendations

Enable verbose logging of authenticated REST API and AJAX calls, capturing user ID, action, and response code
Monitor for anomalous spikes in requests to Easy Blocks Pro endpoints from newly registered accounts
Alert on modifications to plugin content or configuration outside expected administrator workflows

How to Mitigate CVE-2024-54256

Immediate Actions Required

Update the Easy Blocks Pro plugin to a version released after 1.0.21 that addresses the missing authorization flaw
Disable or remove the plugin if a fixed version is not yet available for your installation
Review WordPress user accounts and disable open self-registration where it is not required

Patch Information

At the time of NVD publication, the vendor advisory referenced by Patchstack lists all versions up to and including 1.0.21 as vulnerable. Administrators should apply the latest available plugin release from the vendor and verify that the update introduces capability checks on the affected endpoints.

Workarounds

Restrict access to wp-admin/admin-ajax.php and REST API routes for the plugin using a WAF rule that requires an administrator role
Temporarily deactivate the Easy Blocks Pro plugin until a patched version is deployed
Enforce the principle of least privilege by auditing existing accounts and removing unnecessary low-privilege users

bash

# Deactivate the vulnerable plugin using WP-CLI until a patch is applied
wp plugin deactivate easy-blocks-pro

# List installed version to confirm exposure
wp plugin get easy-blocks-pro --field=version

# Update to the latest available release
wp plugin update easy-blocks-pro