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

As cited

Copy frozen at 2026-10-20 13:53 UTC (site build).

threat intel

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

Malicious calendar invites have surged dramatically as an attack vector, with email security firms documenting a 1,216% increase in August 2026 and continued acceleration through September. The volume of these attacks grew from thousands monthly in April to over 118,000 by September 2026. Attackers are exploiting calendar functionality to bypass traditional email security controls and reach targets.

Why it matters: Organizations and security teams must detect and block calendar-based phishing and malware delivery, as these invites often evade quarantine and appear legitimate in user inboxes.

Source published

2026-10-20 12:18 UTC

First seen by Cybersecurity Tracker

2026-10-20 12:45 UTC