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Phishing Campaigns Exploit Microsoft 365 Collaboration Features

Phishing Campaigns Exploit Microsoft 365 Collaboration Features

First seen 23 Jun 2026, 09:09 UTC

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ThreatCluster AI
ThreatCluster June 24, 2026 at 08:46 UTC
  • Attackers are using Microsoft 365 features to disguise phishing attempts.
  • Malicious actions are hidden within routine productivity workflows.
  • Organizations using Microsoft 365 need to enhance user awareness and security measures.

Cyber attackers are increasingly leveraging Microsoft 365 collaboration tools, specifically Outlook Groups and calendar invites, to execute phishing campaigns. This method disguises malicious activities within routine workflows, making it difficult for users to identify threats. The technique involves sending what appears to be legitimate group additions or calendar updates, which can lead users to take harmful actions. Fortra's Security Engineer, Daud Jawad, highlighted that this approach shifts the focus from a single suspicious email to a more trusted environment, increasing the likelihood of user engagement. As a result, organizations using Microsoft 365 may face heightened risks of falling victim to these sophisticated phishing attempts. The current status indicates a growing trend in such attacks, necessitating increased vigilance among users and IT departments.

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Timeline

2026-06-23
Phishing technique reported
Fortra reported that attackers are abusing Microsoft 365 collaboration features to conduct phishing campaigns.
Feeds2.Feedburner
2026-06-23
CalPhishing campaigns identified
Gbhackers reported a trend of using Outlook calendar invites to deliver persistent phishing lures.
Gbhackers

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