Business account hijacking is a cyberattack where criminals gain unauthorized access to a company's online accounts, such as email, cloud services, or financial platforms. Attackers often use phishing, credential stuffing, or malware to steal login credentials. Once inside, they can steal sensitive data, initiate fraudulent transactions, impersonate company officials, or spread malware to clients and partners. The consequences can include financial loss, reputational damage, and legal liabilities. Preventing business account hijacking requires strong authentication methods, employee training, regular monitoring for suspicious activities, and prompt incident response. Organizations should also enforce strict password policies and use multi-factor authentication to reduce risk.