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TI-2023-04052 Aliases CVE-2023-4386GHSA-w4jx-8cv4-c4v7

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

Priority LOW 39CWE-502Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. 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_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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00879 59th percentileScored 2026-11-07
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

VendorProductAffected versionsFixed inStatusSource
wpdevteamEssential Blocks Proup to 1.1.0—No fix listedCNA
wpdevteamGutenberg Essential Blocks – Page Builder for Gutenberg Blocks & Patternsup to 4.2.0—No fix listedCNA
  • 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 · 1

CPEVersionsRoleVendor
cpe:2.3:a:wpdeveloper:essential_blocks:*:*:*:*:*:wordpress:*:*up to 4.2.0Vulnerablewpdevteam
  • cpe:2.3:a:wpdeveloper:essential_blocks:*:*:*:*:*:wordpress:*:* Versions up to 4.2.0 Vulnerable ·wpdevteam

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-4386
  2. 2026-10-03 Alias added: GHSA-w4jx-8cv4-c4v7

References

Advisory 1

Other 1

  • 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-2023-04066 Essential Blocks <= 4.2.0 - Unauthenticated PHP Object Injection via products CVSS 3.1CRITICAL 9.8
  • 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-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