WHMCS is the leading web hosting automation platform. Handling signups, provisioning, billing and support.
They also provide loginshare module to integrate third party Helpdesk like Kayako. Recently they released a security patch for Kayako Loginshare module and it is highly recommended to apply this patch. Only Kayako loginshare users need to apply this patch.
This patch addresses an issue that affects the security and integrity of loginshare verification for users attempting to login to Kayako using their WHMCS account credentials.
How to apply Kayako Loginshare security patch?
Download the patch here from their official website.
To apply the patch, upload the file contained within the zip archive to /modules/support/kayako/loginshare.php
No installation or upgrade process is required.