Microsoft Teams is finally boosting security controls to let admins block custom file extensions

Date:
Mon, 21 Sep 2026 13:11:13 +0000

Description:
Microsoft is set to give admins more control over specifically which file types can and can't be shared on Teams.

FULL STORY ======================================================================Copy link Facebook X Whatsapp Reddit Pinterest Flipboard Threads Email Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Subscribe to our newsletter Weaponizable File Protection is getting more custom controls months after launching Teams has become an attractive environment for attackers lately Microsoft is set to add plenty of new features, too Microsoft has announced an upgrade to its Weaponizable File Protection feature within Teams, which now means admins can control which types of files users can send through the workplace collaboration app to prevent the likelihood of spreading malware and other malicious files.

Weaponizable File Protection is a tool that's already been rolled out to Teams, but previously, it only automatically scanned for potentially
dangerous attachments. The automated part of the tool began rolling out in early 2026 after an earlier preview from a roadmap entry, and it's another roadmap entry that shows us what we can expect moving forward. Latest Videos From TechRadar Watch full video here: Teams admins can now block certain file types "Administrators will be able to customize which file types are blocked in Teams to align with their organization's security requirements or continue using the Microsoft-recommended default list," a new roadmap entry reads.

According to the entry, Microsoft is aiming for a November 2026 rollout, so
it shouldn't be long before admins gain greater control over prescribing
which file types are blocked across the organization. You may like Microsoft Teams administrators finally get the option to block external bots from meetings Microsoft Teams wants to block bad bots for good Microsoft makes major Teams AI U-turn following user revolt

And it's around one year ago this month that Microsoft rolled out a largely similar, automated feature across Teams that scanned links for potentially malicious intent.

"Unlike email, Teams traffic typically bypasses secure email gateways and benefits from the perceived legitimacy of a colleague-initiated chat, which can make lures particularly effective in this environment," Microsoft wrote
in a separate security study in a bid to explain why Teams attacks are becoming increasingly common. Are you a pro? Subscribe to our newsletter Sign up to the TechRadar Pro newsletter to get all the top news, opinion, features and guidance your business needs to succeed! Contact me with news and offers from other Future brands Receive email from us on behalf of our trusted partners or sponsors By submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over.

More broadly, it looks like November's gearing up to be a big month for Teams both from a security perspective but also in terms of new features. Other roadmap entries point toward introduction like simultaneous screen sharing
for two presenters, breakout room support for Android and a Meeting Shared Files window where users can easily access attachments from specific
meetings. Follow TechRadar on Google News and add us as a preferred source to get our expert news, reviews, and opinion in your feeds.



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Link to news story: https://www.techradar.com/pro/security/microsoft-teams-is-finally-boosting-sec urity-controls-to-let-admins-block-custom-file-extensions


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