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Vulnerabilities

Vulnerability · CVE-2026-4001

Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')

Published Mar 24, 2026 · catalog updated Jun 17, 2026 · Woocommerce Custom Product Addons Pro

Patch now

CVE-2026-4001 is in the CISA known-exploited catalog. Confirm Woocommerce Custom Product Addons Pro against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
0.99%
Remediation
Remediation guidance
Affected products
stated Woocommerce Custom Product Addons Pro · vendor acowebs Woocommerce Custom Product Addons Pro

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}).

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated Woocommerce Custom Product Addons Pro<= 5.4.1
  • vendor acowebs Woocommerce Custom Product Addons Proversion unspecified

How to fix CVE-2026-4001

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-4001 is in the CISA known-exploited catalog. Confirm Woocommerce Custom Product Addons Pro against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with Woocommerce Custom Product Addons Pro <= 5.4.1. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-95. EPSS 0.99%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 24, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  2. Mar 24, 2026 · NIST NVD

    Detected

    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 san

  3. Jun 17, 2026 · NIST NVD

    Updated

    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 san

Sources

  • CVE.orgVulnerability recordCVE-2026-4001

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-4001

    30-day exploitation probability 1.0%

    first.org
  • NIST NVDVulnerability recordCVE-2026-4001

    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 insuf

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-4001

    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 insuf

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.