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Bugs in the multi-factor authentication system used by Microsoft’s cloud-based office productivity platform, Microsoft 365, opened the door for hackers to access cloud applications via a bypass of the security system, according to researchers at Proofpoint.
The flaws exist in the implementation of what is called the WS-Trust specification in cloud environments where WS-Trust is enabled and used with Microsoft 365, formerly called Office 365. WS-Trust is an OASIS standard that provides extensions to WS-Security and is used for renewing and validating security tokens, brokering trust relationships – part of a secure message-exchange architecture.
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