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Microsoft 365 Massive Outage – Fixes Fail as Restored Servers Keep Going Unresponsive
Matched: health
A Microsoft 365 outage exceeding 10 hours continues as restored servers repeatedly fail under user traffic load. Beginning November 12, 2026, the disruption spread from Exchange Online to Teams, SharePoint, Copilot, and Defender across all regions. Microsoft is rebuilding servers on previous configurations, limiting traffic, and rerouting load while analyzing root cause. Over 120,000 Outlook reports peaked across 74 countries. No cyberattack is involved.
Massive Microsoft 365 Outage Impacts Exchange Online, Teams, SharePoint, Copilot, and Defender XDR Users
Matched: health
A major Microsoft 365 outage beginning November 12, 2026 disrupted Exchange Online, Teams, SharePoint, Copilot, and Defender XDR globally. Microsoft attributed the failure to servers unexpectedly going offline, overloading remaining infrastructure. Failed automated health checks complicated recovery, with restored servers becoming unresponsive under traffic load. Engineers rerouted traffic and explored configuration rollbacks. Full restoration had not been confirmed. Administrators should monitor incidents MO1550821 and EX1550543 in the Microsoft 365 admin center.
Microsoft Teams Outage Hits Users in North America
Matched: health
Microsoft is investigating a Teams outage affecting North American users, tracked as TM1550488 in the Microsoft 365 admin center. Automated recovery measures are underway, with telemetry showing reduced impact, though full restoration is unconfirmed. No root cause, timeline, or affected features have been specified. Administrators are advised to monitor the admin center and document user-reported issues for comparison against official updates.
Mirage2FA Phishing Kit Bypasses MFA to Hijack Microsoft 365 Sessions, Targeting 3,500+ Organizations
Matched: health
A phishing-as-a-service toolkit called Mirage2FA, linked to the group LinX Coders, has potentially compromised 4,532 Microsoft 365 accounts across 3,518 organizations in 94 countries, with 63.7% of victims in the US. The kit uses HTML, XHTML, and SVG attachments to deploy adversary-in-the-middle proxies that capture authenticated session cookies, bypassing MFA without dropping malware. Over half of 9,332 recorded compromise events involved cookie theft, making simple password resets insufficient for remediation.
Microsoft Teams Outage Largely Mitigated After Users Lost Access to Multiple Features
Matched: health
Microsoft Teams suffered an outage on August 26, 2026, primarily affecting Asia-Pacific users who could not join or create meetings, with some unable to share screens. Microsoft attributed the disruption to maintenance activity with unintended consequences. By 7:26 a.m. IST, the company reported the issue largely mitigated and said engineers would monitor for 15–30 minutes to prevent recurrence. One-to-one calls remained functional during the incident.