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Surge in Calendar Phishing Attacks Targeting Google and Microsoft Users

First seen 2 Dec 2025, 18:33 UTC

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ThreatCluster March 12, 2026 at 13:27 UTC

Sublime Security reported a significant increase in phishing attacks using calendar invites to bypass security measures. These attacks primarily target users of Google Workspace and Microsoft 365, leveraging social engineering tactics to exploit human vulnerabilities. The phishing incidents often involve disguised calendar invitations or .isc attachments.

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