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CISA Urges Immediate Patching of Critical PHP Remote Code Execution Vulnerabilities

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued an urgent advisory regarding two severe vulnerabilities in the PHP programming language that allow unauthenticated remote code execution. Identified as CVE-2026-109618 and CVE-2026-109619, the flaws affect all environments processing web requests with PHP and have been nicknamed php2shell. CISA recommends applying patches to PHP 8.5.12, 8.4.27, 8.3.36, or 8.2.35 without delay, or taking affected systems offline if updates cannot be applied immediately. Although no exploitation has been observed yet, organizations are instructed to inventory PHP usage, prioritize internet-facing systems, and monitor for suspicious activity such as shell processes spawned from PHP workers. Web application firewalls may offer partial protection but are not considered a substitute for patching.

Security NEXTTranslated from Japanese

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The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has strongly recommended that organizations immediately apply security updates for the PHP programming language following the disclosure of two critical vulnerabilities.

The flaws, tracked as CVE-2026-109618 and CVE-2026-109619 and sometimes referred to as php2shell, were publicly detailed on October 21, 2026. They impact every environment that uses PHP to handle web requests and permit remote attackers to execute arbitrary code without authentication.

CISA advises organizations to first identify all PHP installations within their infrastructure and update them to the patched versions PHP 8.5.12, PHP 8.4.27, PHP 8.3.36, or PHP 8.2.35. Internet-connected systems should receive priority attention, and any embedded PHP components must also be reviewed.

If timely patching is not feasible, CISA recommends taking the affected systems offline. While web application firewalls may provide some level of protection, they are not sufficient; systems running PHP should remain offline until updates are applied.

Security teams are further encouraged to monitor for indicators of compromise, including the launch of shell processes from PHP worker processes or the unexpected download of tools onto servers.

CVE-2026-109618CVE-2026-109619PHP 8.5.12PHP 8.4.27PHP 8.3.36
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