CVE-2026-12428
Deferred Deferred - Pending Action

Unauthorized Data Access in Blocks for ACF Fields WordPress Plugin

Publication date: 2026-07-09

Last updated on: 2026-07-09

Assigner: Wordfence

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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Meta Information

Published
2026-07-09
Last Modified
2026-07-09
Generated
2026-07-15
AI Q&A
2026-07-09
EPSS Evaluated
2026-07-14
NVD
CVE-2026-12428
EUVD
EUVD-2026-42568

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
acf_fields blocks_for_acf_fields to 1.6.2 (inc)
acf blocks_for_acf_fields to 1.6.2 (inc)
acf_fields blocks to 1.6.2 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Impact Analysis

This vulnerability can lead to unauthorized disclosure of sensitive data stored in ACF fields on WordPress sites using the affected plugin.

Attackers with Author-level access or higher can read private or draft posts and other protected content that they normally should not have permission to view.

Such unauthorized data access can compromise confidentiality and potentially expose sensitive or private information.

Executive Summary

The Blocks for ACF Fields plugin for WordPress has a vulnerability due to a missing capability check in the get_all_values() function within the /wp-json/acf-field-blocks/v1/values REST endpoint in versions up to and including 1.6.2.

Specifically, the permission check only verifies a generic publish_posts capability, and the function passes a user-supplied id parameter directly to get_field_objects() without verifying if the user is authorized to access the requested object.

This flaw allows authenticated users with Author-level access or higher to read Advanced Custom Fields (ACF) values from arbitrary posts, including private posts, drafts, and posts by other users, which they should not be able to access.

Compliance Impact

This vulnerability allows authenticated users with Author-level access and above to read Advanced Custom Fields (ACF) values from arbitrary posts, including private posts and drafts, without proper authorization checks.

Unauthorized access to sensitive or private data can lead to violations of data protection regulations such as GDPR and HIPAA, which require strict controls on access to personal and protected health information.

Therefore, exploitation of this vulnerability could result in non-compliance with these standards due to improper data access controls.

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