Unauthenticated PHP object injection in PDF Invoice for WooCommerce
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.
Summary
The PDF Invoice for WooCommerce + Drag and Drop Template Builder plugin for WordPress, through 7.1.1, has a PHP object injection flaw (CWE-502) in how it handles the customer_note checkout field. Untrusted input reaches unserialize() without validation, so attacker-controlled content is deserialized during invoice generation. An unauthenticated remote attacker can execute code on the server on a default install.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| add-ons.org | PDF Invoice for WooCommerce + Drag and Drop Template Builder | up to 7.1.1 | — | No fix listed | CNA |
- PDF Invoice for WooCommerce + Drag and Drop Template Builder Vendoradd-ons.org Affected up to 7.1.1 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for PDF Invoice for WooCommerce + Drag and Drop Template Builder.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Timeline
- 2026-10-31 Threatist record created from CVE-2026-109220
- 2026-10-31 Alias added: GHSA-5f8r-hw67-6cx4
- 2026-11-03 CISA SSVC decision points changed
References
Other 8
- https://www.wordfence.com/threat-intel/vulnerabilities/id/1bc3529c-6161-4b89-8a35-c3a9b7b8c308?source=cve
- https://plugins.trac.wordpress.org/browser/pdf-for-woocommerce/tags/7.1.1/vendor/mpdf/mpdf/src/Mpdf.php#L9105
- https://plugins.trac.wordpress.org/browser/pdf-for-woocommerce/tags/7.1.1/woocommerce/shortcodes.php#L708
- https://plugins.trac.wordpress.org/browser/pdf-for-woocommerce/tags/7.1.1/woocommerce/emails/index.php#L70
- https://plugins.trac.wordpress.org/browser/pdf-for-woocommerce/tags/7.1.1/frontend/index.php#L378
- https://plugins.trac.wordpress.org/browser/pdf-for-woocommerce/tags/7.1.1/libs/HtmlDocument.php#L300
- https://plugins.trac.wordpress.org/browser/pdf-for-woocommerce/tags/7.1.1/libs/HtmlNode.php#L1266
- https://downloads.wordpress.org/plugin/pdf-for-woocommerce.7.2.0.zip
More add-ons.org vulnerabilities
- TI-2025-31435 WordPress Drag and Drop File Upload for Elementor Forms Plugin <= 1.5.3 - Arbitrary File Upload Vulnerability CVSS 3.1CRITICAL 10.0
- TI-2025-29989 WordPress Drag and Drop File Upload for Elementor Forms plugin <= 1.4.3 - Arbitrary File Deletion Vulnerability CVSS 3.1HIGH 8.6
- TI-2026-15087 Drag and Drop File Upload for Elementor Forms <= 1.6.0 - Unauthenticated Arbitrary File Upload via 'type' Parameter CVSS 3.1CRITICAL 9.8
- TI-2025-37450 WordPress PDF for Elementor Forms + Drag And Drop Template Builder plugin <= 6.5.0 - PHP Object Injection vulnerability CVSS 3.1HIGH 8.8
- TI-2025-37449 WordPress PDF Invoice Builder for WooCommerce plugin <= 6.5.0 - Deserialization of untrusted data vulnerability CVSS 3.1HIGH 8.8
- TI-2025-37448 WordPress PDF for WPForms plugin <= 6.5.0 - Deserialization of untrusted data vulnerability CVSS 3.1HIGH 8.8
Sources
- CVE-2026-109220 · CVE Program
- CVE-2026-109220 · NVD
- FIRST EPSS
- GHSA-5f8r-hw67-6cx4 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences