Is CVE-2026-4066 actively exploited?

No active exploitation of CVE-2026-4066 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4066 be exploited remotely?

Yes. CVE-2026-4066 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4066?

CVE-2026-4066 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2026-4066

CWE-862Published: March 23, 2026· Updated: Mar 24, 2026

4.3

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.9th

Official 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.

NVD Source

Technical Analysis

CVE-2026-4066 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.