CVE-2025-66143: Crumber Elementor Auth Bypass Vulnerability

CVE-2025-66143 Overview

CVE-2025-66143 is a Missing Authorization vulnerability discovered in the Crumber plugin for WordPress Elementor, developed by merkulove. This Broken Access Control vulnerability allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized actions within affected WordPress installations.

The vulnerability stems from CWE-862 (Missing Authorization), indicating that the plugin fails to properly verify user permissions before allowing access to certain functionality. This type of vulnerability is particularly dangerous in WordPress environments where plugins often handle sensitive site configuration and content management tasks.

Critical Impact

Unauthorized users may be able to access restricted functionality or perform privileged actions without proper authentication, potentially compromising WordPress site integrity and security.

Affected Products

• Crumber WordPress Plugin versions up to and including 1.0.10
• WordPress sites using crumber-elementor plugin
• Elementor page builder integrations utilizing the Crumber plugin

Discovery Timeline

• 2026-01-22 - CVE CVE-2025-66143 published to NVD
• 2026-01-22 - Last updated in NVD database

Technical Details for CVE-2025-66143

Vulnerability Analysis

This vulnerability falls under the category of Broken Access Control, specifically Missing Authorization (CWE-862). The Crumber plugin for Elementor fails to implement proper authorization checks for certain operations, allowing users without the necessary permissions to access or modify protected resources.

In WordPress plugin architecture, proper authorization typically involves verifying user capabilities using functions like current_user_can() before executing sensitive operations. When these checks are missing or improperly implemented, attackers can bypass intended access restrictions.

The vulnerability affects all versions of the Crumber plugin from the initial release through version 1.0.10, indicating a fundamental design flaw in the plugin's access control implementation rather than a regression in a specific update.

Root Cause

The root cause of CVE-2025-66143 is the absence of proper authorization verification within the Crumber plugin's codebase. WordPress plugins must explicitly check user permissions before performing privileged operations, and this plugin fails to implement these necessary security controls.

Missing authorization vulnerabilities typically occur when developers assume that authentication alone is sufficient, or when AJAX endpoints and REST API routes are created without corresponding capability checks. The plugin likely exposes functionality that should be restricted to administrators or editors to any authenticated user, or potentially even unauthenticated visitors.

Attack Vector

An attacker targeting this vulnerability would identify plugin endpoints or functions that lack proper authorization checks. The attack flow typically involves:

1. Identifying exposed AJAX actions or REST API endpoints registered by the Crumber plugin
2. Crafting requests to these endpoints without proper authorization
3. Executing privileged operations that should be restricted to specific user roles
4. Potentially modifying site content, settings, or gaining further access to the WordPress installation

Since this is a WordPress plugin vulnerability, exploitation would occur over the network via HTTP requests to the affected WordPress site. The attack complexity is relatively low as it requires only identifying the vulnerable endpoints and submitting appropriately crafted requests.

Detection Methods for CVE-2025-66143

Indicators of Compromise

• Unexpected modifications to WordPress content or settings associated with the Crumber plugin
• Unusual requests to Crumber plugin AJAX endpoints in web server access logs
• Unauthorized changes to Elementor page layouts or breadcrumb configurations
• Evidence of low-privileged or anonymous users accessing administrative plugin functions

Detection Strategies

• Review web server logs for suspicious requests to /wp-admin/admin-ajax.php with Crumber-related action parameters
• Monitor WordPress audit logs for unauthorized changes to plugin settings or page content
• Implement Web Application Firewall (WAF) rules to detect and block unauthorized access attempts to plugin endpoints
• Conduct periodic security scans of WordPress installations to identify vulnerable plugin versions

Monitoring Recommendations

• Enable WordPress debug logging to capture unauthorized access attempts
• Deploy file integrity monitoring on WordPress installations to detect unexpected changes
• Configure alerts for bulk or automated requests targeting plugin functionality
• Implement user activity monitoring to track privilege escalation attempts

How to Mitigate CVE-2025-66143

Immediate Actions Required

• Identify all WordPress installations using the Crumber plugin (crumber-elementor)
• Check the currently installed version of the plugin against the vulnerable range (versions through 1.0.10)
• Monitor the plugin developer (merkulove) and WordPress plugin repository for security updates
• Consider temporarily disabling the plugin if it is not essential to site functionality until a patch is available

Patch Information

At the time of publication, administrators should check the Patchstack WordPress Vulnerability Report for the latest information on available patches. Monitor the WordPress plugin repository for updates to the Crumber plugin that address this vulnerability.

To check your current plugin version, navigate to the WordPress admin dashboard, select Plugins, and locate Crumber in the plugin list. Compare the installed version against any patched versions announced by the developer.

Workarounds

• Temporarily disable the Crumber plugin until an official patch is released if the functionality is not critical
• Implement Web Application Firewall (WAF) rules to restrict access to known vulnerable endpoints
• Limit user registrations and minimize the number of authenticated users with access to the WordPress site
• Review and restrict user roles to ensure only necessary permissions are granted
• Consider using WordPress security plugins that provide additional access control layers

# WordPress CLI commands to check and manage the Crumber plugin
# Check current plugin status and version
wp plugin list --name=crumber-elementor --fields=name,status,version

# Temporarily deactivate the vulnerable plugin
wp plugin deactivate crumber-elementor

# Check for available plugin updates
wp plugin update crumber-elementor --dry-run