Vulnerability · Published Feb 11, 2026 · Assigned by Wordfence
CVE-2026-1560Custom Block Builder – Lazy Blocks <= 4.2.0 - Authenticated (Contributor+) Remote Code Execution
High 8.8
In plain English
A high-severity code injection in Custom Block Builder – Lazy Blocks from nko. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 9.4% (higher than 95% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nko | Custom Block Builder – Lazy Blocks | 0 – through 4.2.0 |
Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://www.wordfence.com/threat-intel/vulnerabilities/id/b1853c88-277b-4955-b042-aeed1cffb49b?source=cve
- https://plugins.trac.wordpress.org/browser/lazy-blocks/trunk/classes/class-rest.php#L88
- https://plugins.trac.wordpress.org/browser/lazy-blocks/trunk/classes/class-blocks.php#L1637
- https://plugins.trac.wordpress.org/browser/lazy-blocks/trunk/classes/class-blocks.php#L766
- https://plugins.trac.wordpress.org/changeset/3454012/