DEBULL Exploits Microsoft Device-Code Flow in Recent Phishing Campaign
Between late June and early July 2026, a sophisticated phishing campaign leveraging the DEBULL tooling targeted Microsoft 365 accounts. Unlike traditional phishing methods, this campaign utilized collaboration-themed lures to direct users into the legitimate Microsoft device login experience. By exploiting the OAuth 2.0 Device Authorization Grant flow, attackers bypassed multi-factor authentication (MFA) and gained unauthorized access to victim accounts. The DEBULL platform, likely a phishing-as-a-service (PhaaS) offering, enabled threat actors to generate and poll device-code tokens, facilitating account takeovers without the need for password theft. This method allowed for persistent access, leading to potential data exfiltration and further exploitation within compromised environments. ([thehackernews.com](https://thehackernews.com/2026/07/debull-tooling-abuses-microsoft-device.html?utm_source=openai)) The emergence of DEBULL signifies a notable evolution in phishing tactics, emphasizing the shift towards abusing legitimate authentication processes to circumvent traditional security measures. This trend underscores the necessity for organizations to enhance their security protocols, particularly in monitoring and mitigating risks associated with OAuth flows and device code authentication mechanisms. ([thehackernews.com](https://thehackernews.com/2026/07/debull-tooling-abuses-microsoft-device.html?utm_source=openai))
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