Microsoft is extending Teams security to detect malicious links hidden inside QR codes and warn users after a message has been delivered. The update adds QR code checks to existing Microsoft Defender for Office 365 protections, giving users clearer warnings and security teams more data to investigate suspicious messages. According to Message Center notice MC1490905, published on October 7, worldwide rollout begins in early October 2026 and is expected to finish by early November. The feature applies to organizations using Microsoft Teams with Defender for Office 365 and requires no separate setup by end users. The new protection checks Teams messages containing QR codes after delivery. Defender extracts the web addresses stored...
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