Frequency
1
occurrences
First Seen
April 13, 2026
Last Seen
April 13, 2026
Related Threat Clusters
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Surge in Mailbox Rule Abuse Threatens Microsoft 365 Security
Security researchers have reported a significant increase in the abuse of mailbox rules within Microsoft 365 environments, with attackers leveraging these native email features to maintain access and exfiltrate data…
5 articles · Updated April 13, 2026
Recent Intelligence Reports
- Mailbox rules in O365—a post — Proofpoint · April 13, 2026