# CVE-2026-14900: StylemixThemes Cost Calculator Builder PRO remote code execution in js_to_php

Source: https://junglewise.ai/threats/cve-2026-14900-stylemixthemes-cost-calculator-builder-pro-remote-code-execution  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-29. Updated: 2026-07-29  
License: CC BY 4.0 with a link back

CVE-2026-14900 · Severity: critical · CVSS 9.8 · Published 2026-07-29

The Cost Calculator Builder PRO plugin for WordPress, which allows businesses to create interactive price estimation forms, contains a critical security flaw. An attacker can exploit this vulnerability to remotely execute malicious code on the website's server without needing to log in. This could lead to a complete takeover of the website, theft of customer data, or the installation of ransomware.

Vendors: [StylemixThemes](https://junglewise.ai/threats/vendors/stylemixthemes).

## Quick answers

**Is CVE-2026-14900 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-14900 being exploited in the wild.

**How severe is CVE-2026-14900?** Critical severity, with a CVSS score of 9.8, published 29 July 2026.

**Which products and versions are affected?** StylemixThemes Cost Calculator Builder PRO 0 - 4.0.3.

**Is there a fix for CVE-2026-14900?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-14900 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-14900?** Check whether you run StylemixThemes Cost Calculator Builder PRO at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A Remote Code Execution (RCE) vulnerability exists in the Cost Calculator Builder PRO plugin for WordPress (versions up to 4.0.3) within the js_to_php() function. The root cause is the insufficient sanitization of the 'orderDetails[*].originalValue' field, which is injected directly into a formula string passed to the PHP eval() function. While the evaluateFormula() function employs a regex allow-list, it only filters alphanumeric tokens, allowing non-word punctuation characters to remain. Attackers can bypass these restrictions using non-word XOR gadgets. Although a nonce check is present, the required nonce is publicly accessible via the wp_head hook, allowing unauthenticated attackers to achieve full code execution.

## Affected products

- StylemixThemes Cost Calculator Builder PRO 0 - 4.0.3

## Timeline

- 2026-07-29: disclosed: Vulnerability published by Wordfence and NVD

## References

- [https://stylemixthemes.com/cost-calculator-plugin/](https://stylemixthemes.com/cost-calculator-plugin/)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/4c8f2872-06ff-41a2-b601-77a47470de0c?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/4c8f2872-06ff-41a2-b601-77a47470de0c?source=cve)