03 Two critical flaws in PHP
PHP is the technology powering millions of websites, including WordPress sites. On October 21, 2026, PHP’s security team published two critical vulnerabilities, CVE-2026-109618 and CVE-2026-109619, and rated both 9.2 out of 10 on the CVSS 4.0 scale.
Both are flaws in how PHP handles memory between one visitor’s request and the next. The National Vulnerability Database describes each one as able to lead to remote code execution, meaning that under the right conditions an attacker could run their own code on the server behind a website.
Whether a particular site is exposed depends on the PHP version it runs and how it is kept up to date.
Two flaws, both 9.2 out of 10, in the technology WordPress sites run on.