BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations

A phishing-as-a-service framework called BigBear 2.0 has been used to bypass multi-factor authentication at 258 organizations and steal more than 5,000 Microsoft 365 credentials. Researchers at cybersecurity company CloudSEK gained administrator access to the control panel and found that the service managed 42 VPS nodes, all configured to target Microsoft 365 as part of the observed operation [1].

Sources

1. bleepingcomputer.com · BigBear Microsoft 365 phishing service bypassed MFA at 258 organizations Sep 7, 2026

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