Remote Code Execution Vulnerability in Custom Block Builder Plugin for WordPress
CVE-2026-1560

8.8HIGH

Key Information:

Vendor

WordPress
Status
Custom Block Builder – Lazy Blocks
Vendor
CVE Published:
11 February 2026

What is CVE-2026-1560?

The Custom Block Builder – Lazy Blocks plugin for WordPress has a vulnerability that allows authenticated attackers with Contributor-level access or higher to execute arbitrary code on the server. This security flaw arises from several functions within the 'LazyBlocks_Blocks' class, affecting all versions up to and including 4.2.0. It is crucial for users to update their plugins to avoid potential exploits.

Affected Version(s)

Custom Block Builder – Lazy Blocks 0 <= 4.2.0

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/lazy-blocks/tr...
https://plugins.trac.wordpress.org/browser/lazy-blocks/tr...

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Youssef Elouaer
.