Skip to content
OpenAdvisories
High · 8.8 Public exploit CVE-2026-1560 EUVD-2026-5960GHSA-3h85-7292-2f8x

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

Published Feb 11, 2026 · Updated Apr 8, 2026 · Assigned by Wordfence

Vendor: nko Product: Custom Block Builder – Lazy Blocks Category: Web / CMS

Description

The Custom Block Builder – Lazy Blocks plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 4.2.0 via multiple functions in the 'LazyBlocks_Blocks' class. This makes it possible for authenticated attackers, with Contributor-level access and above, to execute code on the server.

Affected products

VendorProductAffectedFixed
nko Custom Block Builder – Lazy Blocks ≤ 4.2.0 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References