I believe there are two reliable methods built-in to cwp.
1) Firewall Configuration: /etc/csf/csf.conf
There is a directive/setting labeled AUTO_UPDATES set to 1 by default. Change this to 0.
2) CWP Scripts
I have not attepted this method but according to cwp wiki there are scripts. One of these scripts is labeled update_cwp. This may just pertain to the core but there are others as well. It may be worth looking into.
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CentOS Web Panel has also scripts folder to help you with the upgrades or additional tool installations.
For all of you liking to work in a shell we are preparing additional scripts list.
Available Scripts with the latest version
update_cwp //Update CWP to the latest version
upgrade_mysql //Upgrade phpMyAdmin and MySQL to 5.5
install_imagick //Installs Image Magick
install_maldet //Installs Maldet
install_net2ftp //Installs Net2FTP, Usage
http://IP/net2ftpuser_backup //Create User backup, Usage: sh /scripts/user_backup USERNAME
whoowns //Get Domain owner, Usage: sh /scripts/whoowns DOMAIN
list_users //List all user accounts
list_domains //List all addon domains
list_subdomains //List all Sub-Domains
cwp_bruteforce_protection //Enable CSF/LFD Brute/Force protection
mysql_pwd_reset //Reset root MySQL password
Usage
sh /scripts/SCRIPT-NAME
/scripts/SCRIPT-NAME
…many others coming soon
Source:
http://wiki.centos-webpanel.com/cwp-scripts---------------------
Currently running
Distro Name: CentOS release 6.8 (Final)
Kernel Version: 2.6.32-642.6.1.el6.i686
CWP version: 0.9.8.82