With cyberattacks targeting workplace environments on the rise, Microsoft Teams security has become a top priority for the Redmond company. After several major security incidents in recent months, Microsoft is announcing two new protection features for September 2025, aimed at strengthening the security of its collaboration platform.
Two new layers of protection for Teams
Microsoft has quietly added two crucial security features to its public roadmap that will transform protection for Teams users. These improvements, listed under IDs 499892 and 499893 in the Microsoft 365 roadmap, mark a turning point in Microsoft’s proactive approach to security.
Automatic blocking of suspicious files
The first Microsoft Teams security update introduces a sophisticated scanning system that automatically inspects every message exchanged on the platform. This feature instantly blocks any file deemed suspicious before it reaches its destination. For companies deploying Teams at scale, this preventive protection is an essential barrier against ransomware and spyware infiltration.
This measure directly addresses the concerns of IT administrators who have seen their organisations hit by sophisticated attacks. A single click on a malicious file can compromise a company’s entire network, especially if the principle of defence in depth is not applied, as recent attack campaigns using Teams as an infection vector have shown.
Proactive detection of fraudulent URLs
The second Microsoft Teams security feature focuses on protection against phishing. The system will now analyse every link shared in Teams chats and channels in real time. When a fraudulent URL is detected, the user will receive an explicit warning before even clicking the suspicious link.
This protection is particularly relevant given the rise in impersonation attempts via Teams. Cybercriminals increasingly exploit the trust placed in internal communications to spread malicious links to fake company websites or booby-trapped login portals.
A response to recent security failures
These Microsoft Teams security improvements come at a tense time for Microsoft. The company recently faced several major incidents: the attack by the Black Basta group last November, a critical flaw in Microsoft 365 revealed in August and a massive hack of its servers in July. These new features reflect Microsoft’s determination to restore the trust of its business users.
In parallel, Microsoft is also developing an artificial intelligence dedicated to malware detection for Microsoft Defender, underlining the comprehensive approach taken to secure the Microsoft 365 ecosystem.
Microsoft Teams security
With these two new Microsoft Teams features planned for September 2025, Microsoft is showing its commitment to protecting hybrid work environments. In a competitive market facing solutions such as Slack, these security improvements could well be a decisive advantage in winning over security-conscious companies.
Microsoft Teams security FAQ
The two new Microsoft Teams features will be rolled out in September 2025, according to the official Microsoft 365 roadmap.
The system automatically scans all messages and instantly blocks files deemed suspicious before they reach users, protecting against ransomware and spyware.
No, the fraudulent URL detection feature will be enabled automatically and will warn users before they click suspicious links.
Yes, these Microsoft Teams features will be built in automatically at no extra cost for Microsoft 365 users.
These improvements respond to recent cyberattacks targeting Teams and Microsoft 365, including the Black Basta group attack and various security flaws discovered in recent months.
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