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Microsoft 365

Microsoft's cloud productivity and email suite.

Microsoft 365 sign-in pages were the credential target of a hotel WiFi DNS-poisoning campaign that ReliaQuest reported on 23 July 2026; the login flow was spoofed, not Microsoft 365 itself.

Last refreshed: 3 August 2026 · Appears in 1 active topic

Key Question

How are attackers spoofing Microsoft 365 logins via hotel WiFi?

Timeline for Microsoft 365

#12 22 Jul

Hotel WiFi steers guests to fake logins

Cybersecurity: Threats and Defences
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Background

Microsoft 365 is Microsoft's cloud productivity and email suite, used widely across corporate environments. It featured in reporting as the credential target of a hotel WiFi campaign: compromised routers used DNS poisoning to redirect guests to counterfeit Microsoft 365 sign-in pages, harvesting corporate credentials from travellers across several American cities plus India and Saudi Arabia.

The counterfeit pages harvested corporate credentials from hotel guests, not any data from Microsoft's own servers; ReliaQuest's 23 July report found no compromise of the Microsoft 365 service itself.

Common Questions
What is Microsoft 365?
Microsoft 365 is Microsoft's cloud-based productivity and email suite, including Outlook, Teams and SharePoint, used by organisations for corporate identity and communication.Source: ReliaQuest hotel WiFi campaign findings
How did hotel WiFi routers steal Microsoft 365 credentials?
Compromised hotel routers used DNS poisoning to redirect guest lookups to attacker-controlled, counterfeit Microsoft 365 sign-in pages, harvesting typed credentials with no phishing email or malware needed.Source: ReliaQuest hotel WiFi campaign findings
Was Microsoft 365 itself hacked in the hotel WiFi campaign?
No. The compromise targeted the login flow via poisoned hotel router DNS responses, not Microsoft's own infrastructure or the Microsoft 365 service itself.Source: ReliaQuest hotel WiFi campaign findings