What’s Vulnerable › Vulnerabilities

CVE-2026-1560: Custom Block Builder – Lazy Blocks <= 4.2.0 - Authenticated (Contributor+) Remote Code Execution

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 9.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-11 · updated 2026-06-17
• Weakness: CWE-94

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

• nko Custom Block Builder – Lazy Blocks: through 4.2.0

References

• 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/browser/lazy-blocks/trunk/classes/class-rest.php#L88
• https://plugins.trac.wordpress.org/changeset/3454012/
• https://www.wordfence.com/threat-intel/vulnerabilities/id/b1853c88-277b-4955-b042-aeed1cffb49b?source=cve

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