Last week cybercriminals deployed ransomware to 1,500 organizations, including many that provide IT security and technical support to other companies. The attackers exploited a vulnerability in software from Kaseya , a Miami-based company whose products help system administrators manage large networks remotely. Now it appears Kaseya’s customer service portal was left vulnerable until last week to a data-leaking security flaw that was first identified in the same software six years ago.