Quarantined, but still on your calendar: The explosion of invite-based attacks

There has been a sharp escalation in attacks that use malicious calendar invites to reach targets, email security providers Check Point and Sublime Security have warned. Sublime recorded a 1,216% month-over-month increase in August 2026, and the first half of September alone surpassed the whole of August by 1,426%. Check Point’s numbers tell a similar story: the volume of these emails grew from a few thousand a month in April to more than 118,000 in … More → The post Quarantined, but still on your calendar: The explosion of invite-based attacks appeared first on Help Net Security .