CVE-2026-39675: Court Reservation Auth Bypass Vulnerability

CVE-2026-39675 Overview

CVE-2026-39675 is a Missing Authorization vulnerability (CWE-862) in the webmuehle Court Reservation WordPress plugin. This broken access control flaw allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized access to protected functionality within the plugin.

Critical Impact

Attackers can bypass authorization checks to access restricted features or data within the Court Reservation plugin due to missing authorization enforcement.

Affected Products

• webmuehle Court Reservation plugin versions through 1.10.11
• WordPress installations running vulnerable versions of the court-reservation plugin

Discovery Timeline

• 2026-04-08 - CVE-2026-39675 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2026-39675

Vulnerability Analysis

This vulnerability stems from a Missing Authorization weakness (CWE-862) in the Court Reservation WordPress plugin. The plugin fails to properly implement authorization checks on certain functionality, allowing users to access features or perform actions they should not be permitted to execute based on their role or authentication status.

In WordPress plugin architecture, authorization controls are typically enforced through capability checks using functions like current_user_can(). When these checks are missing or improperly implemented, attackers can directly access administrative functions, modify data, or view sensitive information without proper credentials.

The impact of this vulnerability depends on which specific functionality lacks authorization controls, but broken access control vulnerabilities commonly allow unauthorized users to:

• Access administrative features reserved for privileged users
• View, modify, or delete reservation data belonging to other users
• Change plugin settings or configurations
• Perform actions that should require authentication while unauthenticated

Root Cause

The root cause is the absence of proper authorization verification within the Court Reservation plugin's code paths. The plugin does not adequately check whether the requesting user has the necessary permissions before processing certain requests. This is a fundamental access control implementation failure where the developers did not enforce the principle of least privilege.

Attack Vector

An attacker can exploit this vulnerability by identifying endpoints or AJAX actions within the Court Reservation plugin that lack proper authorization checks. By directly requesting these unprotected resources—either as an unauthenticated user or as a low-privileged authenticated user—the attacker can bypass intended access restrictions.

The attack typically involves:

1. Identifying vulnerable endpoints through reconnaissance or code review
2. Crafting requests directly to the unprotected functionality
3. Bypassing the expected authorization workflow to perform privileged actions

For detailed technical analysis, refer to the Patchstack Vulnerability Analysis.

Detection Methods for CVE-2026-39675

Indicators of Compromise

• Unusual administrative actions performed by non-administrative users in WordPress logs
• Unexpected modifications to reservation data or plugin settings
• Access to Court Reservation plugin endpoints from unauthenticated sessions
• Anomalous patterns in WordPress AJAX request logs targeting court-reservation plugin actions

Detection Strategies

• Monitor WordPress activity logs for unauthorized access attempts to Court Reservation plugin functionality
• Review web server access logs for direct requests to plugin endpoints that should require authentication
• Implement Web Application Firewall (WAF) rules to detect and block suspicious requests targeting the plugin
• Audit user activity within the plugin for actions performed outside normal permission boundaries

Monitoring Recommendations

• Enable verbose logging for the Court Reservation plugin if available
• Configure SIEM alerts for access control bypass patterns in WordPress environments
• Regularly review user activity and audit trails for privilege escalation indicators
• Monitor for bulk or automated requests targeting plugin endpoints

How to Mitigate CVE-2026-39675

Immediate Actions Required

• Deactivate the Court Reservation plugin (court-reservation) until a patched version is available
• Review WordPress user accounts and remove any unauthorized or suspicious accounts
• Audit existing reservation data and plugin settings for unauthorized modifications
• Consider implementing additional access controls at the web server or WAF level

Patch Information

Organizations should monitor the plugin developer (webmuehle) and WordPress plugin repository for an updated version that addresses this vulnerability. Versions through 1.10.11 are confirmed vulnerable. Check the Patchstack security advisory for updates on patch availability.

Workarounds

• Temporarily disable the Court Reservation plugin until a patch is released
• Restrict access to the WordPress admin panel and plugin pages using IP allowlisting
• Implement server-level access controls to limit who can reach plugin endpoints
• Use a WordPress security plugin with virtual patching capabilities to add authorization checks

# Example: Restrict access to plugin directory via .htaccess
# Add to /wp-content/plugins/court-reservation/.htaccess
<Files "*.php">
    Order Deny,Allow
    Deny from all
    Allow from 127.0.0.1
    # Add your trusted admin IPs below
    # Allow from YOUR.ADMIN.IP.ADDRESS
</Files>