CVE-2026-109217
Received Received - Intake

Sensitive Information Exposure in PDF Invoices & Packing Slips for WooCommerce

Publication date: 2026-10-31

Last updated on: 2026-10-31

Assigner: Wordfence

Description
The PDF Invoices & Packing Slips for WooCommerce plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 5.16.5 via the 'invoice_number (via document filename)' parameter. This makes it possible for unauthenticated attackers to extract another customer's complete invoice PDF — including billing identity, shipping address, private order notes, line items, prices, dates, order ID, and invoice number — delivered directly to the attacker's email as an order confirmation attachment. Exploitation requires the plugin's yearly invoice number reset option to be enabled, and the attacker's guest-checkout order must trigger a processing email within 60 seconds of a victim order that shares the same yearly-reset invoice number.

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Meta Information

Published
2026-10-31
Last Modified
2026-10-31
Generated
2026-10-31
AI Q&A
2026-10-31
EPSS Evaluated
N/A
NVD
CVE-2026-109217
EUVD
EUVD-2026-114613

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
wpovernight PDF Invoices & Packing Slips for WooCommerce 0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-524 The code uses a cache that contains sensitive information, but the cache can be read by an actor outside of the intended control sphere.

Attack-Flow Graph

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Executive Summary

The PDF Invoices & Packing Slips for WooCommerce plugin for WordPress has a vulnerability that allows unauthenticated attackers to access sensitive invoice data. This happens through the 'invoice_number' parameter in the document filename. Attackers can retrieve another customer's complete invoice PDF, including personal details like billing address, order notes, and prices, sent directly to their email.

Detection Guidance

This vulnerability cannot be detected via network or system commands as it is a WordPress plugin issue. Check if the plugin 'PDF Invoices & Packing Slips for WooCommerce' is installed and verify its version. If it is version 5.16.5 or lower, it is vulnerable.

Impact Analysis

This vulnerability can lead to exposure of private customer data, including billing identities, shipping addresses, and order details. Attackers can exploit it to steal sensitive information, potentially leading to identity theft or fraud. Businesses using the plugin may face reputational damage and legal consequences.

Compliance Impact

This vulnerability likely violates GDPR and HIPAA due to unauthorized access to personal and sensitive health or financial data. GDPR requires protecting personal data, while HIPAA mandates safeguarding protected health information. Non-compliance can result in heavy fines and legal penalties.

Mitigation Strategies

Update the PDF Invoices & Packing Slips for WooCommerce plugin to the latest version beyond 5.16.5. Disable the yearly invoice number reset option in plugin settings to prevent sequential exposure. Review server logs for suspicious download attempts of invoice PDFs.

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