# CVE-2026-120534: Advanced Custom Fields: Extended PRO code injection in render_field

Source: https://junglewise.ai/threats/cve-2026-120534-the-advanced-custom-fields-extended-pro-plugin-for-wordpress-is  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-03. Updated: 2026-11-03  
License: CC BY 4.0 with a link back

CVE-2026-120534 · Severity: critical · CVSS 9.8 · Published 2026-11-03

The Advanced Custom Fields: Extended PRO plugin for WordPress allows attackers to execute arbitrary WordPress functions without authentication through insufficient validation in form field rendering. An attacker can inject malicious code to call WordPress functions with controlled arguments, potentially leading to unauthorized data modification, account compromise, or site takeover depending on which functions are invoked.

Vendors: [Advanced Custom Fields](https://junglewise.ai/threats/vendors/advanced-custom-fields).

## Quick answers

**Is CVE-2026-120534 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-120534 being exploited in the wild.

**How severe is CVE-2026-120534?** Critical severity, with a CVSS score of 9.8, published 3 November 2026.

**Which products and versions are affected?** Advanced Custom Fields: Extended PRO up to and including 0.9.2.6.

**Is there a fix for CVE-2026-120534?** Yes: fixed in 0.9.2.8. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-120534 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-120534?** Check whether you run Advanced Custom Fields: Extended 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.

## How to fix

- Fixed in 0.9.2.8

## Technical details

The render_field function in Advanced Custom Fields: Extended PRO insufficiently validates form configuration parameters before passing them to call_user_func_array, allowing unauthenticated code injection. Two attack methods exist: one requires the admin to enable a non-default shortcode_preview setting, while the second exploits environments lacking OpenSSL functions where ACF Pro's acf_decrypt falls back to unverified base64 decoding. This enables arbitrary WordPress function execution with attacker-controlled arguments on vulnerable sites.

## Affected products

- Advanced Custom Fields Advanced Custom Fields: Extended PRO up to and including 0.9.2.6

## Timeline

- 2026-11-03: disclosed

## References

- [https://www.acf-extended.com/changelog](https://www.acf-extended.com/changelog)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/b8a7a925-2b9e-43bc-b649-c7ec518e063c?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/b8a7a925-2b9e-43bc-b649-c7ec518e063c?source=cve)