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Device-code phishing OAuth abuse impacting 340+ Microsoft 365 orgs

March 25, 2026The Hacker News, Steven Lim, Nicolas Krassas

The Hacker News and Steven Lim describe a large-scale device-code phishing campaign abusing OAuth device code flows to obtain tokens that remain usable even after password resets.

🛑 A device code phishing campaign is hitting 340+ Microsoft 365 orgs using OAuth abuse.
Victims enter codes on real Microsoft pages, generating access and refresh tokens attackers reuse—even after password resets.
A large-scale phishing campaign has impacted more than 340 Microsoft 365 organizations across the U.S., Canada, Australia, New Zealand, and Germany.
The attackers are exploiting device code authentication flows to steal
A device code phishing campaign is hitting 340+ Microsoft 365 orgs using OAuth abuse.
A large-scale phishing campaign has impacted more than 340 Microsoft 365 organizations
The Hacker News
Steven Lim
Nicolas Krassas
The Cyber Security Hub™
phishing campaignauth bypassincident responsemicrosoftincident responsephishing campaignauth bypass

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