CVE•Published 2023-10-20•Modified 2026-04-08•1 article on news•6 live references•NVD data

CVE-2023-4386Wpdeveloper · Essential_blocks

Vulnerability data via NVD (ingested)

CVSS v3.1

8.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 11% of all CVEs

Weaknesses (CWE)

CWE-502Deserialization of Untrusted Data

Description

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.

Timeline

Published 2023-10-20

Modified 2026-04-08

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2023-4386

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · WP plugin path

http.html:"/wp-content/plugins/essential-blocks/"

Matches any site loading the "essential-blocks" plugin — doesn't rely on Shodan's vuln tag.

Shodan · product

product:"Wpdeveloper Essential Blocks"

All exposed Wpdeveloper Essential Blocks instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Essential Blocks"

HTTP body or banner mentions "Essential Blocks" — catches deploys Shodan didn't identify as a product.