Auth bypass in Inc2734 Smart Custom Fields
CVE-2026-4066
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 a…
Vulnerability class: Broken Access Control
EPSS: 0.000 (2.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Inc2734 Smart Custom Fields — versions 0
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/87f52e3a-e414-4f47-b46c-e3811…
- plugins.trac.wordpress.org/browser/smart-custom-fields/trunk/classes/fields/cla…
- plugins.trac.wordpress.org/browser/smart-custom-fields/trunk/classes/fields/cla…
- plugins.trac.wordpress.org/browser/smart-custom-fields/trunk/classes/fields/cla…
- plugins.trac.wordpress.org/changeset
Frequently asked questions
- What is CVE-2026-4066?
- CVE-2026-4066 is a medium-severity vulnerability in Inc2734 Smart Custom Fields, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-03-23.
- How severe is CVE-2026-4066?
- Medium severity. CVSS v3 base score is 4.3 out of 10.