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CVE-2026-12428

6.5 · MEDIUM

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/va…

Published Jul 9, 2026CWE-862EPSS 0.47%

Overview

CVE-2026-12428 is a medium-severity vulnerability. It was published on July 9, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refplugins.trac.wordpress.org/browser/acf-field-blocks/tags/1.5.0/inc/class-rest.php#L100Refplugins.trac.wordpress.org/browser/acf-field-blocks/tags/1.5.0/inc/class-rest.php#L296Refplugins.trac.wordpress.org/browser/acf-field-blocks/tags/1.5.0/inc/class-rest.php#L302Refplugins.trac.wordpress.org/browser/acf-field-blocks/tags/1.6.0/inc/class-rest.php#L100Refplugins.trac.wordpress.org/browser/acf-field-blocks/tags/1.6.0/inc/class-rest.php#L296Refplugins.trac.wordpress.org/browser/acf-field-blocks/tags/1.6.0/inc/class-rest.php#L302Refplugins.trac.wordpress.org/changeset?reponame=&old=3587876%40acf-field-blocks&new=3587876%40acf-field-blocksRefwww.wordfence.com/threat-intel/vulnerabilities/id/fc48f75d-a2e8-49ea-9bfa-a27a61ff8a84?source=cve

How CyberStrike helps

Frequently asked questions

What is CVE-2026-12428?

CVE-2026-12428 is a medium-severity vulnerability. It was published on July 9, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-12428?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-12428?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-12428?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-12428 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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