Blocks for ACF Fields <= 1.6.2 - Missing Authorization to Authenticated (Author+) Arbitrary ACF Field Value Disclosure via 'id' Parameter

Wordfence Intelligence   >   Vulnerability Database   >   Blocks for ACF Fields <= 1.6.2 - Missing Authorization to Authenticated (Author+) Arbitrary ACF Field Value Disclosure via 'id' Parameter
6.5
Missing Authorization
CVE CVE-2026-12428
CVSS 6.5 (Medium)
Publicly Published July 8, 2026
Last Updated July 9, 2026
Researcher thinnawarth mathuros

Description

The Blocks for ACF Fields plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the get_all_values() function in the /wp-json/acf-field-blocks/v1/values REST endpoint in versions up to, and including, 1.6.2. The permission_callback only verifies the generic publish_posts capability and the handler passes a user-supplied id parameter directly to get_field_objects() without verifying that the requesting user is authorized to read the target object. This makes it possible for authenticated attackers, with Author-level access and above, to read ACF field values from arbitrary posts (including private posts, drafts, posts by other users, and other ACF-supported objects) that they should not have access to.

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Vulnerability Details for Blocks for ACF Fields — Display Custom Fields in the Block Editor

Blocks for ACF Fields — Display Custom Fields in the Block Editor

Software Type Plugin
Software Slug acf-field-blocks (view on wordpress.org)
Patched? Yes
Remediation Update to version 1.6.3, or a newer patched version
Affected Version
  • <= 1.6.2
Patched Version
  • 1.6.3

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