CVE-2026-1560 Custom Block Builder – Lazy Blocks <= 4.2.0 - Authenticated (Contributor+) Remote Code Execution
Authenticated attackers with Contributor access can execute arbitrary code on the server via the Lazy Blocks plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-1560?
CVE-2026-1560 is a high-severity code injection vulnerability in nko Custom Block Builder – Lazy Blocks, published on 11 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-94
Which versions are affected by CVE-2026-1560?
How do I fix CVE-2026-1560?
No fix has been published for CVE-2026-1560 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-1560 being exploited?
There is no known exploitation of CVE-2026-1560 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-3h85-7292-2f8x.