Does the vulnerability affect PHP 8.2 or earlier?

No, it is limited to PHP 8.3.0 and older; PHP 8.3.1 and later contain the fix.

Can I mitigate by disabling dangerous functions only?

Disabling functions helps, but the core flaw remains; a version upgrade is mandatory.

How do I know if my LiteSpeed server uses a vulnerable PHP build?

Run `litespeed -v` or check the PHP module version in the admin panel; look for the LSPHP version number.

2026-11-06 · Q&A guide

How to Detect and Fix PHP2Shell (CVE‑2026‑109618/109619) in PHP

Learn how to identify if your PHP app is vulnerable to PHP2Shell and apply quick fixes.

What Are PHP2Shell Vulnerabilities?

CVE‑2026‑109618 and CVE‑2026‑109619 expose a flaw in PHP’s internal request handling that can be abused to run arbitrary commands. The issue is limited to PHP 8.3.0 and earlier and is also present in server‑side interpreters like LiteSpeed, mod_php, and FrankenPHP that ship with those PHP versions.

Detecting Vulnerability in Your Stack

1. Verify the PHP interpreter version. 2. Check the server configuration for the interpreter used. 3. Run a quick test script to see if the request‑based execution path is still active.

<?php\n// Quick PHP2Shell test\nif (version_compare(PHP_VERSION, '8.3.1', '<')) {\n    echo "Potentially vulnerable PHP version: " . PHP_VERSION;\n} else {\n    echo "PHP version safe: " . PHP_VERSION;\n}\n?>

Mitigation Steps

Upgrade the PHP engine to 8.3.1 or later. For LiteSpeed, install the latest LSPHP build; for Apache, upgrade to mod_php 2.4.57+; for FrankenPHP, upgrade to 0.12.1+. In addition, harden the runtime with the following settings:

/* php.ini */\ndisable_functions = proc_open, shell_exec, passthru, system, exec\nallow_url_include = Off\nopen_basedir = /var/www/html:/tmp\n

Runtime Hardening with ModSecurity

Deploy a ModSecurity rule that blocks suspicious request patterns. The rule below blocks any request containing the PHP2Shell trigger string.

SecRule REQUEST_URI "@rx php://filter" "id:1001,phase:2,deny,status:403,msg:'PHP2Shell attempt detected'"

Post‑Upgrade Validation

After applying the patches, run a vulnerability scanner or a custom test harness that attempts the known exploit vector. Ensure the server returns a 403 or a normal error, not a shell execution.

Takeaway: Upgrade PHP and server interpreters immediately, then harden the configuration to eliminate remote code execution paths.