CVE-2026-4001Network attack vector

Unauthenticated code execution via custom pricing formula

Published Mar 23, 2026 · Updated Mar 23, 2026

Eval injection in Acowebs WooCommerce Custom Product Addons Pro 5.4.1 and earlier allows remote attackers to execute arbitrary server-side code. The process_custom_formula() function in includes/process/price.php passes a text-field value into PHP eval() after sanitize_values() removes HTML tags but leaves single quotes and PHP directives intact. Exploitation is unauthenticated but requires a public WCPA text field configured for custom pricing with {this.value}; successful injection runs code with the WordPress server process privileges.

CVSS severity9.8
Critical
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Eval injection in Acowebs WooCommerce Custom Product Addons Pro 5.4.1 and earlier allows remote attackers to execute arbitrary server-side code. The process_custom_formula() function in includes/process/price.php passes a text-field value into PHP eval() after sanitize_values() removes HTML tags but leaves single quotes and PHP directives intact. Exploitation is unauthenticated but requires a public WCPA text field configured for custom pricing with {this.value}; successful injection runs code with the WordPress server process privileges.

The record

CVE
CVE-2026-4001
Published
Mar 23, 2026
Updated
Mar 23, 2026
Vendor
Acowebs
Product
WooCommerce Custom Product Addons Pro
Classifications
CWE-95, CAPEC-35, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=* <=5.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Acowebs · WooCommerce Custom Product Addons Proversion=* <=5.4.1

Published CVSS scores

9.8WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-95Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
CAPEC-35Leverage Executable Code in Non-Executable Files
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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