Advanced Product Fields (Product Addons) for WooCommerce <= 1.6.21 - Unauthenticated Improper Input Validation to Price Bypass via Add-to-Cart POST Request
Strategic Overview
- Status
- Patched in 1.6.22
- Affected Plugin
- Advanced Product Fields (Product Addons) for WooCommerce
- Affected Version
<= 1.6.21- CVSS
- 7.5High
- Weakness type
- CWE-20 · Improper Input Validation
- CVE
CVE-2026-2996
At a glance
CVE-2026-2996 is a high-severity Improper Input Validation vulnerability in the Advanced Product Fields (Product Addons) for WooCommerce WordPress plugin, affecting versions <= 1.6.21. It carries a CVSS score of 7.5 (reachable over the network; low attack complexity; high integrity impact). Exploitation requires no authentication. The issue is fixed in version 1.6.22; sites on affected versions should update now. Disclosed August 2026, reported by Andrés Cruciani.
Vulnerability Overview
The Advanced Product Fields (Product Addons) for WooCommerce plugin for WordPress is vulnerable to Improper Input Validation in all versions up to, and including, 1.6.21. This is due to a logic flaw in the 'validate_cart_data' function. This makes it possible for unauthenticated attackers to bypass required paid addons and complete purchases at the base product price only, effectively stealing products by paying a fraction of the intended total. The vulnerability was partially patched in version 1.6.19.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on integrity.
CWE-20: Improper Input Validation
Advanced Product Fields (Product Addons) for WooCommerce <= 1.6.21 carries this weakness at validate_cart_data, and reaching it takes no account at all. Improper input validation means the application accepts input without confirming it has the form, type or range the code downstream assumes.
The concrete impact depends on where the unvalidated value lands, which is why records in this class range from cosmetic bugs to full compromise. For Advanced Product Fields (Product Addons) for WooCommerce the fix is 1.6.22: builds <= 1.6.21 are affected, anything from 1.6.22 onward is not.
Remediation
Update to version 1.6.22, or a newer patched version
How does WordSec protect against this?
Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Advanced Product Fields (Product Addons) for WooCommerce 1.6.22 closes this, and updating the plugin is the step that ends it.
- Firewall
- Login Security
- Alerts
External References
Related records
Other vulnerabilities in Advanced Product Fields (Product Addons) for WooCommerce
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