CVE-2026-4066 Details
Description
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.
A vulnerability exists in the Smart Custom Fields plugin for WordPress, in all versions through 5.0.6. The issue arises from a lack of proper capability checks in the 'relational_posts_search' function, which is part of the AJAX actions provided by the plugin. This flaw allows authenticated users with Contributor-level access and above to access private and draft posts from other authors. The function retrieves full WP_Post objects, including the post content, by querying posts with any status. However, it only verifies a generic editing capability, failing to ensure that the user has the right to read each specific post.
Users are advised to update the Smart Custom Fields plugin to version 5.0.7 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Mar 23, 2026CISA-ADP
Assessed Mar 24, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-862 | Missing Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Smart Custom Fields | All versions |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 23, 2026 | New CVE Received | [email protected] |