What is CVE-2026-16623?

CVE-2026-16623 is a high-severity vulnerability in Create Block Theme, classified under Code Injection. CVSS score: 8.0/10. Published 2026-08-04.

How severe is CVE-2026-16623?

High severity. CVSS v3 base score is 8.0 out of 10.

RCE in Create Block Theme

CVE-2026-16623

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.

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.003 (18.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Unknown Create Block Theme — versions 0

Weakness classification (CWE)

CWE-94 — Code Injection

References

contact@wpscan.com (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-16623?: CVE-2026-16623 is a high-severity vulnerability in Create Block Theme, classified under Code Injection. CVSS score: 8.0/10. Published 2026-08-04.
How severe is CVE-2026-16623?: High severity. CVSS v3 base score is 8.0 out of 10.