TI-2023-04066 Aliases CVE-2023-4402 GHSA-xxc8-gpg2-9w9f

Essential Blocks <= 4.2.0 - Unauthenticated PHP Object Injection via products

MEDIUM 46CWE-502Published 2023-10-20 · Updated 2026-04-08

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-502.

Summary

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_products 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01462 73rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
wpdevteam	Essential Blocks Pro	up to 1.1.0	—	No fix listed	CNA
wpdevteam	Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns	up to 4.2.0	—	No fix listed	CNA

Essential Blocks Pro Vendorwpdevteam Affected up to 1.1.0 Fixed in — No fix listed CNA
Gutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patterns Vendorwpdevteam Affected up to 4.2.0 Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:wpdeveloper:essential_blocks::::::wordpress::*	before 4.2.1	Vulnerable	wpdevteam
cpe:2.3:a:wpdeveloper:essential_blocks_pro::::::wordpress::*	before 1.1.1	Vulnerable	wpdevteam

cpe:2.3:a:wpdeveloper:essential_blocks:*:*:*:*:*:wordpress:*:* Versions before 4.2.1 Vulnerable ·wpdevteam
cpe:2.3:a:wpdeveloper:essential_blocks_pro:*:*:*:*:*:wordpress:*:* Versions before 1.1.1 Vulnerable ·wpdevteam

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2023-4402
2026-10-03 Alias added: GHSA-xxc8-gpg2-9w9f

References

Exploit 1

https://plugins.trac.wordpress.org/browser/essential-blocks/trunk/includes/API/Product.php?rev=2950425#L49

Advisory 1

https://www.wordfence.com/threat-intel/vulnerabilities/id/1ede7a25-9bb2-408e-b7fb-e5bd4f594351?source=cve

TI-2023-06070 Essential Blocks < 4.4.3 - Unauthenticated Local File Inclusion CVSS 3.1CRITICAL 9.8
TI-2024-05197 Essential Blocks < 4.7.0 - Contributor+ Stored XSS CVSS 3.1MEDIUM 5.4
TI-2023-28018 WordPress Essential Blocks plugin <= 4.2.0 - Multiple Subscriber+ Broken Access Control vulnerability CVSS 3.1HIGH 8.8
TI-2023-28017 WordPress Essential Blocks plugin <= 4.2.0 - Multiple Contributor+ Broken Access Control vulnerability CVSS 3.1HIGH 8.8
TI-2023-04052 Essential Blocks <= 4.2.0 - Unauthenticated PHP Object Injection via queries CVSS 3.1HIGH 8.1
TI-2025-19742 WordPress Essential Blocks plugin <= 4.8.3 - Broken Access Control vulnerability CVSS 3.1HIGH 8.8

See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences