CVE-2026-4812

Advanced Custom Fields (ACF®) <= 6.7.0 - Unauthenticated Missing Authorization to Arbitrary Post/Page Disclosure via AJAX Field Query Parameters

2026-04-14 12:58
Fernando Mecozzi

Strategic Overview

Status
Patched in 6.7.1
Affected Plugin
Advanced Custom Fields (ACF®)
Affected Version
<= 6.7.0
CVSS
5.3Medium
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2026-4812
View all Advanced Custom Fields (ACF®) vulnerabilities

At a glance

CVE-2026-4812 is a medium-severity Missing Authorization vulnerability in the Advanced Custom Fields (ACF®) WordPress plugin, affecting versions <= 6.7.0. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 6.7.1; sites on affected versions should update now. Disclosed April 2026, reported by Fernando Mecozzi.

Vulnerability Overview

The Advanced Custom Fields (ACF) plugin for WordPress is vulnerable to Missing Authorization to Arbitrary Post/Page Disclosure in versions up to and including 6.7.0. This is due to AJAX field query endpoints accepting user-supplied filter parameters that override field-configured restrictions without proper authorization checks. This makes it possible for unauthenticated attackers with access to a frontend ACF form to enumerate and disclose information about draft/private posts, restricted post types, and other data that should be restricted by field configuration.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.

CWE-862: Missing Authorization

Reaching this weakness in Advanced Custom Fields (ACF®) <= 6.7.0 takes no account at all. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Advanced Custom Fields (ACF®) the fix is 6.7.1: builds <= 6.7.0 are affected, anything from 6.7.1 onward is not.

Remediation

Update to version 6.7.1, or a newer patched version

How does WordSec protect against this?

This one needs no account at all, which puts it outside what login hardening can reach; WordSec's login security narrows the account-level paths around it, and the firewall is what inspects the request itself. None of that substitutes for the fix: Advanced Custom Fields (ACF®) 6.7.1 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-4812https://www.wordfence.com/threat-intel/vulnerabilities/id/51e3a976-a1a3-411a-b88c-f1cb2aa8d5ebhttps://nvd.nist.gov/vuln/detail/CVE-2026-4812

Related records

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