CVE-2026-2996: CWE-20 Improper Input Validation in maartenbelmans Advanced Product Fields (Product Addons) for WooCommerce
Description
The Advanced Product Fields (Product Addons) for WooCommerce plugin for WordPress contains an improper input validation vulnerability in all versions up to and including 1.6.21. This flaw in the 'validate_cart_data' function allows unauthenticated attackers to bypass required paid addons and complete purchases at the base product price, effectively enabling theft of products by paying less than intended. The vulnerability was partially patched in version 1.6.19 but remains present through 1.6.21.
CVSS v3.1
Score 7.5high
Affected software
maartenbelmans
Advanced Product Fields (Product Addons) for WooCommerce
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-2996 describes an improper input validation vulnerability (CWE-20) in the Advanced Product Fields (Product Addons) for WooCommerce plugin. The issue arises from a logic flaw in the 'validate_cart_data' function, which fails to properly enforce required paid addons during purchase. This allows unauthenticated attackers to bypass addon charges and pay only the base product price. The vulnerability affects all versions from initial releases up to and including 1.6.21. A partial patch was introduced in version 1.6.19, but the vulnerability persists until fixed in a later version.
Potential Impact
Exploitation of this vulnerability allows unauthenticated attackers to bypass payment for required paid addons, resulting in financial loss due to customers paying less than the intended total price. There is no impact on confidentiality or availability, but the integrity of purchase transactions is compromised.
Mitigation Recommendations
A partial patch was introduced in version 1.6.19; however, versions up to and including 1.6.21 remain vulnerable. Users should upgrade to a version later than 1.6.21 once available. Patch status is not yet confirmed for versions beyond 1.6.21 — check the vendor advisory for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-02-23T00:50:08.677Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a89a625acd9273b49149cbb
Added to database: 08/22/2026, 13:37:41 UTC
Last enriched: 09/10/2026, 14:49:31 UTC
Last updated: 10/07/2026, 18:48:18 UTC
Views: 53
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