CVE-2026-39592: DEPART WooCommerce Auth Bypass Flaw

CVE-2026-39592 Overview

A Missing Authorization vulnerability has been identified in the DEPART (depart-deposit-and-part-payment-for-woo) WordPress plugin developed by Andy Ha. This vulnerability allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized actions within the plugin's functionality. The vulnerability stems from broken access control mechanisms that fail to properly verify user permissions before executing sensitive operations.

Critical Impact

Unauthorized users may be able to bypass access controls and perform privileged actions within the DEPART plugin, potentially affecting WooCommerce deposit and payment functionality.

Affected Products

• DEPART (depart-deposit-and-part-payment-for-woo) plugin versions through 1.0.7
• WordPress installations using the affected DEPART plugin versions
• WooCommerce stores utilizing DEPART for deposit and partial payment functionality

Discovery Timeline

• 2026-04-08 - CVE-2026-39592 published to NVD
• 2026-04-08 - Last updated in NVD database

Technical Details for CVE-2026-39592

Vulnerability Analysis

This vulnerability is classified under CWE-862 (Missing Authorization), which occurs when software does not perform an authorization check when an actor attempts to access a resource or perform an action. In the context of the DEPART plugin, the missing authorization allows attackers to exploit the incorrectly configured access control security levels.

The DEPART plugin provides deposit and partial payment functionality for WooCommerce stores. The broken access control vulnerability indicates that certain plugin endpoints or functions do not adequately verify whether the requesting user has the appropriate permissions to perform the requested action. This architectural flaw enables unauthorized users to potentially manipulate deposit settings, access payment information, or modify order configurations without proper authentication or authorization.

Root Cause

The root cause of this vulnerability is the absence of proper authorization checks within the DEPART plugin's codebase. When implementing WordPress plugins, developers must explicitly verify user capabilities using functions like current_user_can() before executing privileged operations. The affected versions of DEPART fail to implement these authorization checks consistently, leaving sensitive functionality exposed to unauthorized access.

This type of vulnerability commonly occurs when:

• AJAX handlers lack permission verification
• REST API endpoints omit capability checks
• Admin-only functions are accessible to lower-privileged users
• Nonce verification is present but capability checks are missing

Attack Vector

An attacker can exploit this vulnerability by directly accessing unprotected plugin endpoints or functions without proper authentication. Since the vulnerability involves missing authorization rather than authentication bypass, attackers may need to be authenticated as a low-privileged user (such as a subscriber or customer) to access functionality that should be restricted to administrators or shop managers.

The attack could be executed by:

1. Identifying unprotected AJAX actions or REST API endpoints exposed by the plugin
2. Crafting requests to these endpoints using a low-privileged account
3. Manipulating deposit settings, payment configurations, or order data
4. Potentially escalating privileges or accessing sensitive customer payment information

For detailed technical analysis, refer to the Patchstack security advisory.

Detection Methods for CVE-2026-39592

Indicators of Compromise

• Unexpected modifications to deposit settings or payment configurations in WooCommerce
• Unauthorized AJAX requests to DEPART plugin endpoints from low-privileged user sessions
• Anomalous access patterns to plugin-specific admin functions by non-administrator users
• Unusual changes to order deposit statuses or partial payment records

Detection Strategies

• Monitor WordPress AJAX requests for unauthorized access attempts to DEPART plugin actions
• Implement logging for all plugin-related administrative functions and review for anomalies
• Deploy web application firewall (WAF) rules to detect and block suspicious requests to plugin endpoints
• Audit user activity logs for actions that exceed normal privilege levels

Monitoring Recommendations

• Enable comprehensive WordPress audit logging using security plugins
• Monitor WooCommerce order modifications for unauthorized changes to deposit information
• Implement real-time alerting for failed authorization attempts or privilege escalation indicators
• Review server access logs for direct requests to DEPART plugin PHP files

How to Mitigate CVE-2026-39592

Immediate Actions Required

• Update the DEPART plugin to a patched version when available from the developer
• Review and audit all user accounts with access to the affected WordPress installation
• Temporarily disable the DEPART plugin if updates are not available and the functionality is not critical
• Implement additional access control measures at the web server or WAF level

Patch Information

Organizations using the DEPART plugin should check for updates from the plugin developer and apply patches as soon as they become available. Monitor the Patchstack vulnerability database for the latest patch information and version recommendations.

Until an official patch is released, consider implementing the workarounds listed below to reduce exposure to this vulnerability.

Workarounds

• Restrict access to the WordPress admin panel using IP whitelisting or VPN requirements
• Implement a Web Application Firewall (WAF) with rules to block unauthorized requests to plugin endpoints
• Temporarily deactivate the DEPART plugin if the deposit functionality is not immediately required
• Audit and remove unnecessary user accounts, particularly those with elevated privileges

# Configuration example - Apache .htaccess to restrict admin access
<FilesMatch "admin-ajax\.php">
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</FilesMatch>