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Microsoft Teams: QR code protection in Teams messaging
Microsoft Teams will automatically obscure QR codes in messages from external users by default. Users must explicitly reveal QR codes before viewing or scanning them, enhancing protection against phishing and fraud attempts.
Microsoft's description
Microsoft Teams will provide additional protection for QR codes shared by external users in messages. Images containing QR codes from external senders will be obscured by default and require users to reveal them before viewing or scanning. This helps reduce the risk of phishing and fraud by encouraging more deliberate interaction with QR code content.