Microsoft 365 Users in the UK Experience Copilot Access Issues

First seen 9 Dec 2025, 13:53 UTC • Cybersecuritynews

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On December 9, 2025, Microsoft 365 services faced disruptions in the UK, affecting users' access to Microsoft Copilot and key features. The issue, identified as “CP1193544,” has led to reports of complete inaccessibility or partial degradation among affected users. Microsoft is currently investigating the outage as businesses rely on these AI-driven productivity tools.

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Attack Flow

9 entities, 8 inferred relationships (STIX 2.1).

Technique (2)

Botnet
Malware

Organization (1)

Microsoft

Malware (3)

Broadside
GhostPenguin
Mirai Botnet

Affected Platform (2)

Microsoft 365
Microsoft Copilot

Tool (1)

Flipper

Relationships

Broadside targets Microsoft
GhostPenguin targets Microsoft
Mirai Botnet targets Microsoft
Botnet targets Microsoft 365
Botnet targets Microsoft Copilot
Malware targets Microsoft 365
Malware targets Microsoft Copilot
Broadside related to Flipper

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Microsoft 365 Users in the UK Experience Copilot Access Issues

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