This Microsoft 365 flaw could let ransomware hit OneDrive and SharePoint

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A “potentially dangerous” piece of functionality recently discovered in Office 365 could allow threat actors to encrypt cloud-hosted files and make them unrecoverable without a dedicated backup solution, or a decryption key. 

Cybersecurity researchers from Proofpoint claim the “AutoSave” feature, which automatically saves documents being worked on to the cloud can be abused by the flaw. 



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