# CVE-2026-110018: aBlocks Gutenberg Blocks privilege escalation in form-builder endpoint

Source: https://junglewise.ai/threats/cve-2026-110018-the-ablocks-gutenberg-blocks-user-dashboard-builder-popup  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-24. Updated: 2026-10-24  
License: CC BY 4.0 with a link back

CVE-2026-110018 · Severity: high · CVSS 8.8 · Published 2026-10-24

The aBlocks WordPress plugin contains a flaw in its form builder REST endpoint that allows authenticated Contributors to escalate their account to Editor level or higher. An attacker can exploit a missing permission check to set an arbitrary user role via a login form block saved with a malicious role attribute, then trigger the vulnerable endpoint to elevate their privileges and gain full access to site editing capabilities.

Technologies: [aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder, Form Builder & Animation Builder](https://junglewise.ai/threats/technologies/ablocks-gutenberg-blocks-user-dashboard-builder-popup-builder-form-builder-animation-builder). Vendors: [aBlocks](https://junglewise.ai/threats/vendors/ablocks).

## Quick answers

**Is CVE-2026-110018 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-110018 being exploited in the wild.

**How severe is CVE-2026-110018?** High severity, with a CVSS score of 8.8, published 24 October 2026.

**Which products and versions are affected?** aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder, Form Builder & Animation Builder up to and including 2.17.0.

**Is there a fix for CVE-2026-110018?** 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-2026-110018 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-110018?** Check whether you run aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder or Form Builder & Animation Builder 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 `/ablocks/v1/form-builder/registration` REST endpoint is registered with no permission callback and fails to validate that the block's formType matches the expected `registration` mode before processing the roleSlug parameter from post content. An authenticated Contributor can preserve an arbitrary roleSlug by saving a login-type form block and then invoking the endpoint with a valid nonce and post-ownership check, causing WP_User::set_role() to be called at the elevated privilege level. The vulnerability is bounded by is_safe_registration_role() which prevents promotion to administrator.

## Affected products

- ablocks aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder, Form Builder & Animation Builder up to and including 2.17.0

## Timeline

- 2026-10-24: disclosed

## References

- [https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php](https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php)
- [https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php](https://plugins.trac.wordpress.org/browser/ablocks/tags/2.16.0/includes/api/form-builder-controller.php)

## Related threats

- [aBlocks Gutenberg Blocks plugin sensitive information exposure via shortcode](https://junglewise.ai/threats/cve-2026-118801-the-ablocks-gutenberg-blocks-user-dashboard-builder-popup)
- [aBlocks Gutenberg Blocks stored cross-site scripting in headingTag](https://junglewise.ai/threats/cve-2026-118800-the-ablocks-gutenberg-blocks-user-dashboard-builder-popup)