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Configuring an account with an optional password during account creation or password reset allows the account to have an empty password (i.e. no required password to log in), and exposes it to compromise.
Check that you configured all Active Directory accounts properly to disallow the use of blank passwords, especially for privileged accounts.
How to use the UserAccountControl flags to manipulate user account properties
Name: Account with Possible Empty Password
Codename: C-PASSWORD-NOT-REQUIRED
Severity: High