CVE-2026-25317: WooCommerce Auth Bypass Vulnerability

CVE-2026-25317 Overview

CVE-2026-25317 is a Missing Authorization vulnerability (CWE-862) affecting the Print Invoice & Delivery Notes for WooCommerce plugin developed by tychesoftwares. This broken access control flaw allows attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized actions within WordPress/WooCommerce environments.

The vulnerability exists in versions up to and including 5.9.0 of the plugin, which is widely used by e-commerce sites running WooCommerce to generate and print invoices and delivery notes for orders.

Critical Impact

Unauthenticated attackers can exploit this broken access control vulnerability to perform unauthorized operations, potentially causing denial of service conditions on affected WooCommerce installations.

Affected Products

• Print Invoice & Delivery Notes for WooCommerce plugin versions through 5.9.0
• WordPress sites running the vulnerable plugin versions
• WooCommerce stores utilizing tychesoftwares delivery notes functionality

Discovery Timeline

• 2026-03-25 - CVE-2026-25317 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-25317

Vulnerability Analysis

This vulnerability stems from a Missing Authorization weakness (CWE-862), where the plugin fails to properly verify user permissions before allowing access to protected functionality. The flaw enables unauthenticated remote attackers to bypass access control mechanisms that should restrict certain operations to authorized users only.

The attack can be initiated over the network without requiring any user interaction or prior authentication. While the vulnerability does not appear to compromise data confidentiality or integrity directly, it can result in significant availability impact, potentially causing denial of service conditions on affected e-commerce sites.

Root Cause

The root cause of CVE-2026-25317 is the absence of proper authorization checks within the Print Invoice & Delivery Notes for WooCommerce plugin. The affected code paths lack capability verification, allowing requests to proceed without confirming that the requesting user has appropriate permissions. This represents a fundamental broken access control pattern where authentication may be present but authorization is missing.

Attack Vector

The vulnerability is exploitable via network-based attacks against WordPress installations running the vulnerable plugin. An attacker does not need any privileges, credentials, or user interaction to exploit this flaw.

The attack flow involves:

1. Identifying a WordPress site running Print Invoice & Delivery Notes for WooCommerce version 5.9.0 or earlier
2. Sending crafted requests to plugin endpoints that lack proper authorization checks
3. Bypassing access control mechanisms to trigger unauthorized functionality
4. Potentially causing resource exhaustion or denial of service conditions

The vulnerability can be exploited by sending unauthenticated requests to plugin functionality that should be restricted. For detailed technical analysis, see the Patchstack Vulnerability Report.

Detection Methods for CVE-2026-25317

Indicators of Compromise

• Unusual volume of requests to WooCommerce delivery notes endpoints from unauthenticated sources
• Unexpected access patterns to invoice or delivery note generation functions
• Server resource exhaustion or performance degradation without corresponding legitimate traffic increases
• Error logs showing unauthorized access attempts to plugin-specific functionality

Detection Strategies

• Monitor web application logs for anomalous requests targeting /wp-content/plugins/woocommerce-delivery-notes/ paths
• Implement Web Application Firewall (WAF) rules to detect and block suspicious access patterns to the plugin's endpoints
• Review WordPress access logs for unauthenticated requests to protected plugin functionality
• Deploy endpoint detection to identify unusual process behavior on WordPress hosting servers

Monitoring Recommendations

• Enable detailed logging for WordPress and WooCommerce plugin activity
• Set up alerts for abnormal traffic patterns targeting plugin endpoints
• Monitor server resource utilization for unexpected spikes that may indicate exploitation attempts
• Implement rate limiting on plugin-specific endpoints to mitigate potential abuse

How to Mitigate CVE-2026-25317

Immediate Actions Required

• Update Print Invoice & Delivery Notes for WooCommerce to a patched version above 5.9.0
• Review WordPress user permissions and access control configurations
• Audit logs for any signs of exploitation attempts
• Consider temporarily disabling the plugin if an update is not immediately available

Patch Information

Site administrators should update the Print Invoice & Delivery Notes for WooCommerce plugin to the latest available version that addresses this broken access control vulnerability. Check the official WordPress plugin repository or tychesoftwares website for the most recent secure release.

For additional vulnerability details and patch status, refer to the Patchstack Vulnerability Report.

Workarounds

• Implement WAF rules to restrict access to plugin endpoints for unauthenticated users
• Use WordPress security plugins to add additional authorization layers to sensitive functionality
• Restrict network access to WordPress admin and plugin areas via IP allowlisting where feasible
• Consider disabling the plugin entirely until an official patch is applied

# WordPress plugin management - disable vulnerable plugin via WP-CLI
wp plugin deactivate woocommerce-delivery-notes

# Verify current plugin version
wp plugin list --name=woocommerce-delivery-notes --fields=name,version,status

# Update plugin to latest version when patch is available
wp plugin update woocommerce-delivery-notes