CVE-2026-25407: Cookiebot Authorization Bypass Vulnerability

CVE-2026-25407 Overview

CVE-2026-25407 is a Missing Authorization vulnerability affecting the Cookiebot WordPress plugin. This security flaw allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized access to plugin functionality. The vulnerability stems from missing authorization checks (CWE-862) that fail to properly validate user permissions before granting access to sensitive operations.

Critical Impact

Authenticated attackers with low-level privileges can bypass access controls to access restricted functionality within the Cookiebot plugin, potentially exposing sensitive configuration data.

Affected Products

• Cookiebot WordPress Plugin versions through 4.6.4
• WordPress installations using vulnerable Cookiebot versions

Discovery Timeline

• 2026-02-19 - CVE-2026-25407 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-25407

Vulnerability Analysis

This vulnerability falls under the Broken Access Control category, specifically Missing Authorization (CWE-862). The Cookiebot plugin fails to implement proper authorization checks before allowing access to certain plugin functions. This means that authenticated users with low-level privileges (such as subscribers) can potentially access functionality that should be restricted to administrators.

The attack requires network access and a low-privileged authenticated session. The vulnerability does not require user interaction to exploit, making it easier for attackers to take advantage of the flaw once they have basic authentication credentials.

Root Cause

The root cause of CVE-2026-25407 is the absence of proper capability checks within the Cookiebot plugin's code paths. WordPress plugins should use functions like current_user_can() to verify that the logged-in user has the appropriate permissions before executing sensitive operations. The affected versions of Cookiebot fail to implement these authorization checks in certain areas, allowing lower-privileged users to access restricted functionality.

Attack Vector

The attack is network-based and requires the attacker to have a valid authenticated session on the WordPress site, even with minimal privileges. Once authenticated, the attacker can directly access plugin endpoints or functions that lack proper authorization validation. The vulnerability allows for information disclosure, as attackers can read confidential data that should be restricted to administrators.

An attacker would typically:

1. Obtain or create a low-privileged WordPress account (subscriber, contributor)
2. Identify the unprotected Cookiebot plugin endpoints
3. Make direct requests to these endpoints to access restricted functionality
4. Extract sensitive configuration information from the plugin

Detection Methods for CVE-2026-25407

Indicators of Compromise

• Unusual access patterns to Cookiebot plugin endpoints from low-privileged user accounts
• Unexpected HTTP requests to plugin administrative functions from non-administrator sessions
• Audit log entries showing subscriber or contributor accounts accessing plugin settings
• Anomalous API calls to Cookiebot-related WordPress AJAX handlers

Detection Strategies

• Enable comprehensive WordPress audit logging to track user actions and plugin access attempts
• Monitor for HTTP requests to Cookiebot plugin endpoints that originate from users without administrator capabilities
• Implement web application firewall (WAF) rules to detect unauthorized access attempts to plugin administrative functions
• Review WordPress user activity logs for privilege escalation indicators

Monitoring Recommendations

• Configure security plugins to alert on unusual access patterns to the wp-admin area
• Implement real-time monitoring of WordPress AJAX requests targeting the Cookiebot plugin
• Set up alerts for any access to plugin configuration endpoints from non-administrator accounts
• Regularly audit user roles and permissions to ensure principle of least privilege

How to Mitigate CVE-2026-25407

Immediate Actions Required

• Update the Cookiebot WordPress plugin to a version newer than 4.6.4 that includes the security fix
• Audit existing WordPress user accounts and remove unnecessary privileges
• Review access logs for any signs of exploitation prior to patching
• Temporarily restrict plugin access to administrators only if an update is not immediately available

Patch Information

The vulnerability affects Cookiebot versions through 4.6.4. Site administrators should update to the latest version available through the WordPress plugin repository. For detailed information about the vulnerability and patch status, refer to the Patchstack Vulnerability Advisory.

Workarounds

• Implement additional access control through a web application firewall (WAF) to restrict access to plugin endpoints
• Use WordPress security plugins to add capability checks at the application level
• Limit user registration on the WordPress site to reduce the attack surface
• Consider temporarily deactivating the plugin until the patch can be applied if the functionality is not critical

# WordPress CLI command to update the Cookiebot plugin
wp plugin update cookiebot

# Verify current plugin version
wp plugin get cookiebot --field=version

# List all users to audit for unnecessary privileges
wp user list --fields=ID,user_login,roles