This is quite easy in WHMCS, because you just have to remove the custom folders and files.

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As per the email sent a few hours ago, the leak was due to a tawk.to module?

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I reported/worked with the Doc regarding this issue a few weeks back and with my experience, even with the default WHMCS theme, at that time, the issue persisted.

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https://github.com/tawk/tawk-whmcs/blob/master/modules/addons/tawkto/hooks.php

they did this) shut down (or IP locked) their WHMCS instance straight away when the issue was reported/found.

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Numerous fixes have been implemented with the assistance of WHMCS staff, however, none seemed to persist.

If a theme or theme integration is causing such a headache go back to the stock whmcs theme till you figure out wtf is going on. Really that should of happened after the first report.

I faced exactly same issue i was surprised to see some other services under my hostdoc account in whmcs and another account name was showing up i refreshed the page and it was gone.

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I wasn't care about the mentioned issues before reading this. Now I remember, when I enter their WHMCS pages, on the top right corner there's something like "Hello, 用户名".

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Sounds like a caching reverse proxy is misconfigured. Whmcs pages and similar should be no-store.