Summaryinfo

A vulnerability was found in acowebs Woocommerce Custom Product Addons Pro Plugin up to 5.4.1 on WordPress. It has been declared as critical. Affected by this vulnerability is the function eval of the file includes/process/price.php. The manipulation of the argument Field results in eval injection. This vulnerability was named CVE-2026-4001. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in acowebs Woocommerce Custom Product Addons Pro Plugin up to 5.4.1 on WordPress. Affected is the function eval of the file includes/process/price.php. The manipulation of the argument field with an unknown input leads to a eval injection vulnerability. CWE is classifying the issue as CWE-95. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes code syntax before using the input in a dynamic evaluation call (e.g. "eval"). This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The Woocommerce Custom Product Addons Pro plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 5.4.1 via the custom pricing formula eval() in the process_custom_formula() function within includes/process/price.php. This is due to insufficient sanitization and validation of user-submitted field values before passing them to PHP's eval() function. The sanitize_values() method strips HTML tags but does not escape single quotes or prevent PHP code injection. This makes it possible for unauthenticated attackers to execute arbitrary code on the server by submitting a crafted value to a WCPA text field configured with custom pricing formula (pricingType: "custom" with {this.value}).

The weakness was presented by Ren Voza. The advisory is available at wordfence.com. This vulnerability is traded as CVE-2026-4001 since 03/11/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 03/28/2026).

By approaching the search of inurl:includes/process/price.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-14652). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• E-Commerce Management Software

Vendor

• acowebs

Name

• Woocommerce Custom Product Addons Pro Plugin

Version

• 5.4.0
• 5.4.1

CPE 2.3info

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CPE 2.2info

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