Known vulnerabilities in Custom Block Builder – Lazy Blocks

Easily create custom blocks and custom meta fields for Gutenberg without hard coding.

4Reported vulnerabilities

8.8Highest CVSS score

4.3.1Latest version

20,000+Active installs

What to do now

Update Custom Block Builder – Lazy Blocks to 4.3.0 or later. 4 of these have a fixed version available. Updating resolves them.

Plugin last updated: June 11, 2026 / Tested up to WordPress: 7.0.4 / View on wordpress.org

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVE	Severity	Exploit probability next 30 days	Affected versions	Fixed in	Published
CVE-2026-1560	High 8.8	8.6%	0 to 4.2.0 (inclusive)	`4.2.1`	February 11, 2026
CVE-2024-12878	High 7.1	0.6%	Before 3.8.3	`3.8.3`	February 26, 2025
CVE-2026-8981	Medium 4.4	0.1%	Before 4.3.0	`4.3.0`	June 11, 2026
CVE-2025-58258	Medium 4.3	0.3%	4.1.0 and earlier	`4.1.1`	September 22, 2025

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.