Summaryinfo

A vulnerability was found in inc2734 Smart Custom Fields Plugin up to 5.0.6 on WordPress. It has been classified as problematic. This affects the function relational_posts_search. This manipulation causes authorization. This vulnerability is handled as CVE-2026-4066. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in inc2734 Smart Custom Fields Plugin up to 5.0.6 on WordPress and classified as problematic. Affected by this vulnerability is the function relational_posts_search. The manipulation with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality. The summary by CVE is:

The Smart Custom Fields plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on the relational_posts_search() function in all versions up to, and including, 5.0.6. This makes it possible for authenticated attackers, with Contributor-level access and above, to read private and draft post content from other authors via the smart-cf-relational-posts-search AJAX action. The function queries posts with post_status=any and returns full WP_Post objects including post_content, but only checks the generic edit_posts capability instead of verifying whether the requesting user has permission to read each individual post.

The weakness was released by darkestmode. It is possible to read the advisory at wordfence.com. This vulnerability is known as CVE-2026-4066 since 03/12/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/28/2026).

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

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-14618). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• inc2734

Name

• Smart Custom Fields Plugin

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6

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