CVE-2026-109220
CriticalCVSS 9.8Summary
The PDF Invoice for WooCommerce + Drag and Drop Template Builder plugin in versions up to and including 7.1.1 is vulnerable to PHP Object Injection via the 'customer_note' parameter. The checkout field is insufficiently sanitized and passed to unserialize() without validation, allowing unauthenticated attackers to execute code on the server.
Risk Assessment
An unauthenticated attacker can execute arbitrary code on the server, potentially leading to full compromise of the WordPress site. Placing an anonymous order via the public Store API is sufficient.
Recommendation
Update the PDF Invoice for WooCommerce plugin to a version newer than 7.1.1, and until then consider disabling invoice generation or restricting payment methods.
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Original NVD description (English source)
The PDF Invoice for WooCommerce + Drag and Drop Template Builder plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 7.1.1 via the 'customer_note' parameter parameter. This is due to insufficient sanitization of the customer_note checkout field, which is inlined verbatim into invoice HTML, entity-decoded back into a live tag by simplehtmldom, reassembled into raw bytes by mPDF, and passed to unserialize() in _getObjAttr without validation. This makes it possible for unauthenticated attackers to execute code on the server. An unauthenticated attacker can trigger the vulnerable code path on a default install by placing an anonymous WooCommerce checkout via the public Store API (POST /wc/store/v1/checkout) using a Direct Bank Transfer or cheque payment method, which automatically transitions the order to 'on-hold' status and fires the plugin's invoice-generation hook.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

