What is CVE-2023-4386?

CVE-2023-4386 is a high-severity vulnerability in Wpdeveloper Essential Blocks, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2023-10-20.

How severe is CVE-2023-4386?

High severity. CVSS v3 base score is 8.1 out of 10.

Is CVE-2023-4386 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Wpdeveloper Essential Blocks

CVE-2023-4386

The Essential Blocks plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.2.0 via deserialization of untrusted input in the get_posts function. This allows unauthenticated attackers to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

Vulnerability class: Insecure Deserialization

Published 2023-10-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.009 (57.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 57.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.001

Affected products

Wpdeveloper Essential Blocks
Wpdevteam Essential Blocks Pro — versions 0
Wpdevteam Gutenberg Essential Blocks – Page Builder For & Patterns — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

20142995/nuclei-templates

References

www.wordfence.com/threat-intel/vulnerabilities/id/af468f83-d6ad-474c-bf7f-c4eeb… (Third Party Advisory)
plugins.trac.wordpress.org/browser/essential-blocks/trunk/includes/API/PostBloc… (Product)

Frequently asked questions

What is CVE-2023-4386?: CVE-2023-4386 is a high-severity vulnerability in Wpdeveloper Essential Blocks, classified under Deserialization of Untrusted Data. CVSS score: 8.1/10. Published 2023-10-20.
How severe is CVE-2023-4386?: High severity. CVSS v3 base score is 8.1 out of 10.
Is CVE-2023-4386 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.