There's rumors that some of their internal tools use a shared username and password posted in a Slack group. Please never, never do this. Always have separate credentials per user, or even better, use single sign-on for everything. Shared credentials are extremely risky, as you have no idea if ex-employees still have the credentials, and it's way too easy for the credentials to leak
Always use two-factor auth for all your internal tools
Ensure tools have proper access permissions rather than granting every user access to everything
Use an IDS (Intrusion Detection System) to detect anomalies on your network
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