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The issue exists because once a session has been authorized via MFA, Microsoft does not require a new MFA challenge for the duration of the MFA token. As this is not a vulnerability, there was no need to do a preliminary disclosure. Mitiga said it has reached out to Microsoft, but has not yet received a response.

Twitter savaged by former security boss Mudge in whistleblower complaintĪs noted earlier, the criminals use a design weakness in 365 MFA to maintain persistence, which allows them to add a new authenticator app connected to the compromised user's profile without the victim's knowledge.

Attacker snags account details from streaming service Plex.

Microsoft finds critical hole in operating system that for once isn't Windows.

VMware confirms Carbon Black causing BSODs, boot loops on Windows.

This also means the stolen session cookie remains valid, and the attacker can establish persistence in the 365 environment.