CVE-2026-1560CWE-94

Custom Block Builder – Lazy Blocks <= 4.2.0 - Authenticated (Contributor+) Remote Code Execution

High · published February 11, 2026

CVSS v3.1
8.8
EPSS
9%
Percentile
95.4
In the wild
Unconfirmed
What it is

⚡ A single login is all it takes for an attacker to gain Remote Code Execution in the Lazy Blocks plugin for WordPress! 🌐 Think of it like a restaurant where a contributor-level employee can access the kitchen and start cooking up unauthorized dishes. In this case, they can whip up harmful code instead of culinary delights! An attacker with Contributor access could exploit this vulnerability to execute malicious code on your server, potentially leading to data breaches, site defacement, or even complete control over your website. The consequences could be absolutely devastating, putting your entire online presence at risk!

Put simply

Think of it like a restaurant where a contributor-level employee can access the kitchen and start cooking up unauthorized dishes. In this case, they can whip up harmful code instead of culinary delights! This vulnerability in the Lazy Blocks plugin's 'LazyBlocks_Blocks' class allows authenticated users to execute arbitrary code due to insufficient input validation in multiple functions. Any user with contributor-level access or higher can exploit this flaw.

What to do

An attacker with Contributor access could exploit this vulnerability to execute malicious code on your server, potentially leading to data breaches, site defacement, or even complete control over your website. The consequences could be absolutely devastating, putting your entire online presence at risk! To safeguard your site, immediately update the Lazy Blocks plugin to version 4.2.1 or later. Additionally, review user access levels and restrict privileges to only what's necessary for each user role. You’ve got this! Implement these steps, and you'll be one step closer to fortifying your WordPress fortress! 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.09442 · 95.4th percentile
Weakness
CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-02-11T08:26Z
EPSS history
Timeline
  • 11 FEB 08:26Z
    Custom Block Builder – Lazy Blocks <= 4.2.0 - Authenticated (Contributor+) Remote Code Execution
    cvelistv5