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Microsoft has warned customers to mitigate a high-severity vulnerability in Exchange Server hybrid deployments that could allow attackers to escalate their privileges in Exchange Online cloud environments without leaving any traces. [...]
CISA has urged government agencies and private sector organizations using Microsoft's Exchange cloud email platform to expedite the switch from Basic Authentication legacy authentication methods without multifactor authentication (MFA) support to Modern Authentication alternatives. [...]
Security researchers are warning that threat actors could hijack Office 365 accounts to encrypt for a ransom the files stored in SharePoint and OneDrive services that companies use for cloud-based collaboration, document management and storage. [...]