Securing User Identities in Microsoft 365

This chapter explores the risks of user enumeration in Microsoft 365, detailing how attackers can exploit login processes and password resets to identify valid users. It emphasizes the critical need for implementing strong security measures such as multi-factor authentication (MFA) and robust password policies to protect sensitive employee information, especially in vulnerable industries. Additionally, the discussion covers DNS security best practices, highlighting the importance of DNSSEC and effective email hygiene to mitigate the risk of DNS spoofing and preserve domain integrity.