CVE-2026-16623: Unknown Create Block Theme

High severity, CVSS 8.0. EPSS: 0.5% chance of exploitation in the next 30 days.

The Create Block WordPress plugin before 2.10.0 does not correctly escape user-supplied text before writing it into a generated PHP pattern file, allowing a multisite subsite administrator (who holds the capability gating this action but is denied the capability that normally gates PHP file editing) to inject and execute arbitrary PHP code on the server.

Affected products

• Unknown Create Block Theme: before 2.10.0 (fixed in 2.10.0)

Published 2026-08-04. Last modified 2026-08-26.