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#Microsoft 365

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CL
MEDIUM
Cloud Security

Microsoft Teams and Office Web File Access Disruptions - Mitigation Guide

Microsoft is investigating a service incident impacting file access in Teams and Office for the web, causing operational delays for global enterprises.

Runtime Rebel Intel
4 min read·Jun 1, 2026
TH
CRITICAL
Threat Intel

BlackFile: Analyzing UNC6671 Vishing & Cloud Data Extortion

Examines UNC6671's BlackFile vishing, AiTM, and cloud data exfiltration tactics against Microsoft 365 & Okta. Actionable mitigations included.

Runtime Rebel Intel
6 min read·May 15, 2026
CL
LOW
Cloud Security

Microsoft Teams Free Backend Change Disrupts Chat and Calling

Microsoft confirms a backend configuration change has broken core functionality for Microsoft Teams Free users, impacting global business communication.

Runtime Rebel Intel
3 min read·Apr 29, 2026
TH
HIGH
Threat Intel

Microsoft Teams Abused in Helpdesk Impersonation Attacks: TTPs & Mitigations

Microsoft warns of helpdesk impersonation attacks via Teams external collaboration. Understand TTPs for initial access, lateral movement, and critical mitigation

Runtime Rebel Intel
4 min read·Apr 20, 2026
TH
CRITICAL
Threat Intel

APT28 FrostArmada DNS Hijack Campaign Steals Microsoft 365 Logins

Authorities disrupt APT28's FrostArmada campaign, which used DNS hijacking of MikroTik and TP-Link routers to steal Microsoft 365 account credentials.

Runtime Rebel Intel
5 min read·Apr 7, 2026
CL
MEDIUM
Cloud Security

Exchange Online Service Change: Solving Outlook for Mac Access Issues

Microsoft addresses a service disruption in Exchange Online caused by virtual account updates affecting Outlook for Mac and mobile device connectivity.

Runtime Rebel Intel
3 min read·Mar 23, 2026
CL
INFO
Cloud Security

Microsoft Investigates Classic Outlook Sync & Connection Issues

Microsoft is actively investigating widespread classic Outlook desktop client synchronization and connectivity problems impacting users globally.

Runtime Rebel Intel
4 min read·Mar 13, 2026