
Playbook5 min read
A PHP2Shell incident remediation playbook in Coverbase Radar
On October 21, 2026 the PHP project shipped emergency fixes for CVE-2026-109618 and CVE-2026-109619, known as PHP2Shell. Both are rated 9.2 on CVSS v4.0 and let an attacker with no credentials run code on servers running PHP 5 through 8. Cloudflare reported exploitation attempts before the fix was out, and CERT-EU and Australia's ACSC told organizations to patch or take affected sites offline. WordPress automatic updates do not install the fix, because the flaw is in the PHP runtime and not in WordPress.
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