National Cybersecurity Center alerts to risk of scams during Microsoft failure

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Briefings

The Centro Nacional de Cibersegurança (CNCS) warned that a global outage of Microsoft 365, starting late November 2026, caused widespread access failures to Outlook, Teams, SharePoint, Copilot, and Defender across dozens of countries including Portugal. The incident originated from a non-malicious technical failure, not malicious activity, and affected government and private sectors. CNCS advised users to remain cautious against phishing attempts using the outage as a pretext, strictly following official Microsoft guidance, and never sharing credentials or clicking suspicious links.

Key points

A global outage of Microsoft 365 began late November 2026, causing access failures to Outlook, Teams, SharePoint, Copilot, and Defender across dozens of countries including Portugal.

The outage was non-malicious in origin, affecting government and private sectors, and prompted CNCS to issue a warning against phishing attempts using the incident as a pretext.

Context

The CNCS, a national cybersecurity authority, issued a warning regarding the global outage of Microsoft 365, which began late November 2026. The incident affected dozens of countries including Portugal, impacting government and private sectors. CNCS advised users to follow official Microsoft guidance and remain cautious against phishing attempts using the outage as a pretext.

Limitations

Evidence covers only the initial outage period and CNCS's public recommendations; specific technical root causes remain unexplained. Data on affected users and precise outage duration is limited to the reported timeframe.

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