Version 9.0.6 (Maintenance Release)
Maintenance





WHMCS-25193 — Define a default region for S3-compatible Storage Providers
WHMCS-25216 — Correct invoice chunking logic
WHMCS-25397 — Improved error handling for ReCaptcha v2 and v3
WHMCS-26068 — Undisclosed Security Fix
WHMCS-26192 — Improved security around Admin password resets.
WHMCS-26194 — Improved security around User password resets.
WHMCS-26206 — Improved security around Invoice processing Hook Points
WHMCS-26338 — Improved security around User logouts.
WHMCS-26339 — Admins require “View Clients Summary” permission to download client files
WHMCS-26425 — Undisclosed Security Fix
WHMCS-26466 — Persist Sign-In Integration notice when appropriate
WHMCS-26624 — Undisclosed Security Fix

WHMCS is compatible with most web server environments that use PHP and MySQL®. However, before you can install or update WHMCS in self-hosted environments, you must ensure that your setup meets the system requirements for your chosen version. For example, before you can upgrade from WHMCS 8.12 to WHMCS 9.0, you must ensure that your system meets all of the system requirements for WHMCS 9.0.

Make sure to check the Marketplace listings for your custom modules. They may have additional requirements.
System Requirements

To successfully run currently-supported versions of WHMCS in a self-hosted environment, your system must meet the following requirements:
Required Recommended
Operating System Linux® N/A
Apache® Web Server Apache 2.x N/A
Apache Extensions N/A mod_rewrite
Apache Handler
(Learn More) Any virtual host or server-wide handler. N/A
PHP Version
(Learn More) PHP 8.2 or 8.3
Minimum ionCube Loader® Version 13.0.2 or higher (PHP 8.2)
14.4.0 or higher (PHP 8.3) N/A
PHP Extensions
(Learn More)

All default compiled extensions.
cURL 7.36 or higher with SSL
GD2 Image Library
IMAP
ionCube Loader
For more information, see Install ionCube Loader.
JSON
PDO
PDO_MySQL
You must compile PDO_MySQL with mysqlnd. Do not compile it with libmysqlclient.
Reflection
XML
BC Math
Fileinfo
GMP
iconv
Intl
mbstring
OpenSSL 1.0.1c or higher (with TLS 1.2 or higher)
SOAP

PHP Memory Limit 64 MB 128 MB
MySQL Version
(Learn More) 5.2 8.x