Admin action: WHMCS 9.0.6 and WHMCS 8.13.5 are available as maintenance releases with security and stability updates. If WHMCS handles billing, support, ordering, automation, or client login for your hosting business, plan the update now.
WHMCS says these releases include Maintenance and Security Updates and is intentionally limiting technical detail to protect installations that have not updated yet. That is normal for billing-panel security releases, and it means the practical action is backup, update, verify, and monitor.
Who Should Act
- Hosting providers running WHMCS 9.0.x should move to WHMCS 9.0.6.
- Providers staying on the 8.13 series should move to WHMCS 8.13.5.
- Older self-hosted WHMCS installs should review supported upgrade paths instead of remaining behind on security maintenance.
Backup First
Before performing any update, keep a full and recent backup of both WHMCS files and the WHMCS database. For cPanel and server-admin teams, that means confirming the backup exists and is restorable before clicking the updater.
- Back up the WHMCS database.
- Back up the WHMCS installation directory, custom templates, hooks, modules, and configuration files.
- Confirm cron, payment gateway, registrar, provisioning, support, and mail integrations are documented before the maintenance window.
Update Path
WHMCS recommends using the Automatic Updater from the WHMCS admin area under Utilities > Update WHMCS. Manual full and incremental packages are also available from the WHMCS download page for teams that maintain their own deployment process.
After Updating
- Verify the exact WHMCS version shown in the admin area.
- Run a safe test through client login, cart, invoice view, ticket view, cron status, and admin search.
- Check module logs for payment, registrar, provisioning, and email delivery errors.
- Confirm custom templates still render correctly on desktop and mobile.
- Tell staff when the update is complete and what symptoms should be reported quickly.
Safe Summary
This is a hosting-operations patch item, not a public technical deep dive. WHMCS has released security maintenance updates for the 9.0 and 8.13 series. Back up first, update to the correct release, and verify the billing workflows your customers depend on.