RCE in Nko Custom Block Builder – Lazy Blocks
CVE-2026-1560
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.
Vulnerability class: RCE (Remote Code Execution)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.089 (95.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.086 · newest: 0.089 · change: +0.003
Affected products
- Nko Custom Block Builder – Lazy Blocks — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.wordfence.com/threat-intel/vulnerabilities/id/b1853c88-277b-4955-b042-aeed1…
- plugins.trac.wordpress.org/browser/lazy-blocks/trunk/classes/class-rest.php
- plugins.trac.wordpress.org/browser/lazy-blocks/trunk/classes/class-blocks.php
- plugins.trac.wordpress.org/browser/lazy-blocks/trunk/classes/class-blocks.php
- plugins.trac.wordpress.org/changeset/3454012/
Frequently asked questions
- What is CVE-2026-1560?
- CVE-2026-1560 is a high-severity vulnerability in Nko Custom Block Builder – Lazy Blocks, classified under Code Injection. CVSS score: 8.8/10. Published 2026-02-11.
- How severe is CVE-2026-1560?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-1560 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.