# CVE-2026-8382: WP Engine Advanced Custom Fields authorization bypass in acf_form

Source: https://junglewise.ai/threats/cve-2026-8382-wp-engine-advanced-custom-fields-authorization-bypass-in-acf-form  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-31. Updated: 2026-05-31  
License: CC BY 4.0 with a link back

CVE-2026-8382 · Severity: medium · CVSS 5.3 · Published 2026-05-31

Advanced Custom Fields is a popular WordPress plugin used to add custom data fields to websites. A security flaw allows unauthorized individuals to modify the title and content of existing website posts if those posts use a specific public form feature. This could lead to website defacement or the unauthorized alteration of public-facing information.

Vendors: [WP Engine](https://junglewise.ai/threats/vendors/wp-engine).

## Quick answers

**Is CVE-2026-8382 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-8382 being exploited in the wild.

**How severe is CVE-2026-8382?** Medium severity, with a CVSS score of 5.3, published 31 May 2026.

**Which products and versions are affected?** WP Engine Advanced Custom Fields Up to and including 6.8.1.

**Is there a fix for CVE-2026-8382?** 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-2026-8382 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-8382?** Check whether you run WP Engine Advanced Custom Fields 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

The Advanced Custom Fields (ACF) plugin for WordPress suffers from a missing authorization check (CWE-862) in the acf_form() functionality. In versions up to and including 6.8.1, the plugin fails to properly validate user permissions during form submission. An unauthenticated remote attacker can exploit this by injecting '_post_title' and '_post_content' parameters into a request directed at a publicly accessible acf_form() instance. This allows the attacker to overwrite the original title and content of the associated post. A patch has been identified in the plugin's trunk repository.

## Affected products

- WP Engine Advanced Custom Fields (ACF) Up to and including 6.8.1

## Timeline

- 2026-05-31: disclosed: Initial disclosure by Wordfence and NVD publication.
- 2026-05-31: advisory

## References

- [https://plugins.trac.wordpress.org/browser/advanced-custom-fields/tags/6.8.0/includes/forms/form-front.php](https://plugins.trac.wordpress.org/browser/advanced-custom-fields/tags/6.8.0/includes/forms/form-front.php)
- [https://plugins.trac.wordpress.org/changeset/3549586/advanced-custom-fields/trunk/includes/forms/form-front.php](https://plugins.trac.wordpress.org/changeset/3549586/advanced-custom-fields/trunk/includes/forms/form-front.php)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/ddb2290d-d4bd-4f70-9fe9-927f49721811?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/ddb2290d-d4bd-4f70-9fe9-927f49721811?source=cve)

## Related threats

- [Advanced Custom Fields WordPress plugin IDOR in relationship updates](https://junglewise.ai/threats/cve-2026-97190-the-advanced-custom-fields-acf-wordpress-plugin-before-6-8-11)