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SECURITY ADVISORY & REMEDIATION · CVE-2026-109618 / CVE-2026-109619

PHP2Shell RCE (CVE-2026-109618): Triage, Log IOCs & Perimeter Lockdown

Complete practitioner remediation guide for PHP2Shell (CVE-2026-109618 & CVE-2026-109619) unauthenticated remote code execution on Nginx, Apache, Windows IIS and PHP-FPM.

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1. Vulnerability Summary & Affected PHP Versions

Disclosed in October 2026, PHP2Shell (tracked as CVE-2026-109618 and CVE-2026-109619) is a critical unauthenticated Remote Code Execution (RCE) flaw in how unpatched PHP CGI/FastCGI handlers parse crafted query-string stream descriptors and environment overrides (`allow_url_include` / `auto_prepend_file` injection vectors).

  • PHP 8.5 Branch: Vulnerable below 8.5.12 (Patched in 8.5.12+)
  • PHP 8.4 Branch: Vulnerable below 8.4.27 (Patched in 8.4.27+)
  • PHP 8.3 Branch: Vulnerable below 8.3.36 (Patched in 8.3.36+)
  • PHP 8.2 Branch: Vulnerable below 8.2.35 (Patched in 8.2.35+)
  • PHP 8.1, 8.0, 7.4 & Older: End-of-Life (EOL) — requires immediate perimeter WAF/FastCGI rule blocking or runtime upgrade.
Open Interactive PHP2Shell Exposure Matrix →

2. Hunting PHP2Shell Indicators of Compromise (IOCs) in Access Logs

Before and after patching, audit your Nginx, Apache, and IIS access logs for encoded `-d`, `auto_prepend_file`, `allow_url_include`, and `php://input` stream probes:

# Search Nginx & Apache logs for CVE-2026-109618 / PHP2Shell exploit strings grep -E -i "(auto_prepend_file|allow_url_include|php://input|%2d%64|-d\+|cgi\.force_redirect)" /var/log/nginx/access.log* /var/log/apache2/access.log*

Our £24 (~$30 USD) Remediation Pack includes tools/php2shell_local_triage.sh, an automated read-only Linux/macOS forensic scanner that checks all installed `php-fpm` and CLI binaries, audits active `php.ini` files for dangerous directives, and scans compressed log archives automatically.

3. Defense-in-Depth: Nginx, Apache, IIS & php.ini Hardening

Even on patched runtimes, security baselines (NIST SP 800-53, ISO 27001, SOC 2, and UK Cyber Essentials v3.2) require stripping version leakage (`expose_php = Off`), disabling OS shell execution primitives in production, and blocking malformed FastCGI path splits:

; Excerpt from templates/php-ini-production-lockdown.ini expose_php = Off allow_url_fopen = Off allow_url_include = Off cgi.force_redirect = 1 cgi.fix_pathinfo = 0 disable_functions = exec,passthru,shell_exec,system,proc_open,popen,pcntl_exec
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Frequently Asked Questions

Which PHP versions are vulnerable to CVE-2026-109618 (PHP2Shell)?

All PHP branches prior to the October 2026 security release: PHP 8.5 below 8.5.12, PHP 8.4 below 8.4.27, PHP 8.3 below 8.3.36, PHP 8.2 below 8.2.35, and all End-of-Life branches (8.1, 8.0, 7.x).

Can I mitigate PHP2Shell at the Nginx, Apache, IIS or Cloudflare WAF layer while waiting for a maintenance window?

Yes. Blocking query strings containing auto_prepend_file, allow_url_include, php://input and encoded -d arguments at your reverse proxy or WAF stops remote exploitation before requests reach PHP-FPM or FastCGI. Drop-in rules for Nginx, Apache, IIS and Cloudflare are included in the FaultyPacket £24 Remediation Pack.

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