Microsoft Exchange Server Spoofing Vulnerability

Microsoft Exchange Server doesn't properly check the format of certain inputs, allowing attackers to impersonate legitimate senders in emails. This could trick users into trusting fraudulent messages.

The vulnerability stems from insufficient input validation (CWE-1286) in Exchange Server's email processing, enabling network-based email spoofing attacks. An unauthenticated attacker can craft malformed inputs that bypass syntactic validation checks, compromising email authenticity and potentially facilitating phishing or social engineering attacks.