Remote Code Execution Vulnerability in Woocommerce Custom Product Addons Pro by WordPress
CVE-2026-4001

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
WooCommerce Custom Product Addons Pro
Vendor
CVE Published:
23 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4001?

The Woocommerce Custom Product Addons Pro plugin for WordPress has a vulnerability that allows Remote Code Execution due to insufficient sanitization of user inputs. Specifically, in the process_custom_formula() function, user-defined custom pricing formulas are not properly validated before being processed by PHP's eval() function. As a result, unauthenticated attackers can exploit this flaw by submitting malicious inputs to achieve arbitrary code execution on the server.

Affected Version(s)

Woocommerce Custom Product Addons Pro 0 <= 5.4.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

hdwebmobile-formula-pricing
Created by htrxuan

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://acowebs.com/woo-custom-product-addons/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ren Voza
.