gamaup Blocks for ACF Fields Plugin up to 1.6.2 REST Endpoint values get_all_values ID improper authorization

Summaryinfo

A vulnerability was found in gamaup Blocks for ACF Fields Plugin up to 1.6.2 and classified as problematic. Affected is the function get_all_values of the file /wp-json/acf-field-blocks/v1/values of the component REST Endpoint. The manipulation of the argument ID results in improper authorization. This vulnerability was named CVE-2026-12428. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in gamaup Blocks for ACF Fields Plugin up to 1.6.2. It has been classified as problematic. Affected is the function get_all_values of the file /wp-json/acf-field-blocks/v1/values of the component REST Endpoint. The manipulation of the argument id with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is available at wordfence.com. This vulnerability is traded as CVE-2026-12428 since 06/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/09/2026). This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• gamaup

Name

• Blocks for ACF Fields Plugin

Version

• 1.6.0
• 1.6.1
• 1.6.2

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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