Vulnerability in PDF Invoices & Packing Slips for WooCommerce — CVE-2026-109217

What to do now

Update PDF Invoices & Packing Slips for WooCommerce to 5.16.6 or later.

Affected versions

• Everything up to and including 5.16.5

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.

This description is reproduced verbatim from the public vulnerability record.

• https://www.wordfence.com/threat-intel/vulnerabilities/id/e68495ad-53ab-4c6b-aecc-1e4bfe34aa0d?source=api-prod

Part of this record comes from Wordfence Intelligence. Original: https://www.wordfence.com/threat-intel/vulnerabilities/id/e68495ad-53ab-4c6b-aecc-1e4bfe34aa0d
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