PHP2Shell: PHP patches critical unauthenticated RCE flaws CVE-2026-109618 and CVE-2026-109619; exploitation attempts seen from Oct 17, broad exploitation after patches
The PHP security team released emergency fixes on October 21, 2026 for two critical core flaws, CVE-2026-109618 and CVE-2026-109619, nicknamed PHP2Shell. Both are rated CVSS v4.0 9.2 and allow unauthenticated remote code execution (RCE) as the web worker account. They can also expose process memory that may hold credentials and API keys (…