Microsoft Teams
Microsoft Teams to warn of suspicious traffic with external domains
Microsoft is working on a new Teams security feature that will analyze suspicious traffic with external domains to help IT administrators tackle potential security threats. As explained in a Microsoft 365 roadmap update this week, the “External Domains Anomalies Report” will help admins protect their organizations without disrupting legitimate business communications. The new tool will do […]
Microsoft is speeding up the Teams desktop client for Windows
Microsoft says it will add a new Teams call handler beginning in January 2026 to reduce launch times and boost call performance for the Windows desktop client. A new process, ms-teams_modulehost.exe, will be used after rollout to handle calling features under the primary ms-teams.exe app process, according to Microsoft. “We’re improving the performance and startup […]
Microsoft Teams to let users report messages wrongly flagged as threats
Microsoft says that Teams users will be able to report false-positive threat alerts triggered by messages incorrectly flagged as malicious. This new feature was first announced in September, when it entered a targeted rollout phase, and will roll out to users worldwide by the end of November 2025. “Microsoft Teams now enables users to report messages they […]
Microsoft rolls out screen capture prevention for Teams users
Microsoft is rolling out a new Teams feature for Premium customers that will automatically block screenshots and recordings during meetings. Microsoft announced the feature in May 2025, stating that the rollout would begin in July 2025. However, as revealed on Wednesday, this was delayed until early November. Named “Prevent screen capture,” it restricts access to visual meeting […]
Microsoft 365 outage blocks access to Teams, Exchange Online
Microsoft is working to resolve an ongoing outage preventing users from accessing Microsoft 365 services, including Microsoft Teams, Exchange Online, and the admin center. While Redmond has yet to disclose which regions are currently affected, it currently tracks it on the Service Health Dashboard as an incident, which is commonly used to describe a critical […]
Fake Microsoft Teams installers push Oyster malware via malvertising
Hackers have been spotted using SEO poisoning and search engine advertisements to promote fake Microsoft Teams installers that infect Windows devices with the Oyster backdoor, providing initial access to corporate networks. The Oyster malware, also known as Broomstick and CleanUpLoader, is a backdoor that first appeared in mid-2023 and has since been linked to multiple campaigns. […]
Microsoft adds malicious link warnings to Teams private chats
Microsoft Teams will automatically alert users when they send or receive a private message containing links that are tagged as malicious. Microsoft will introduce these new warnings for messages containing URLs that have been flagged as spam, phishing, or malware, for all Microsoft Defender for Office 365 (MDO) and Microsoft Teams enterprise customers. The new link […]
Microsoft: Anti-spam bug blocks links in Exchange Online, Teams
Microsoft is working to resolve a known issue that causes an anti-spam service to mistakenly block Exchange Online and Microsoft Teams users from opening URLs and quarantine some of their emails. In a service alert seen by GeekFeed, the company stated that the issue is caused by the anti-spam engine incorrectly tagging URLs contained within other URLs […]
Microsoft shares workaround for Teams “couldn’t connect” error
Microsoft is resolving a known issue that causes “couldn’t connect” errors when launching the Microsoft Teams desktop and web applications. The company states that the error is caused by a recent change to Teams’ sidebar, but has yet to disclose which regions are affected by this ongoing issue. While Microsoft has yet to share more […]
Microsoft Teams to protect against malicious URLs, dangerous file types
Microsoft recently revealed that it’s enhancing protection against dangerous file types and malicious URLs in Teams chats and channels. “Microsoft Teams now blocks messages containing weaponizable file types, such as executables, in chats and channels, increasing protection against malware and other file-based attacks,” the company said in a Microsoft 365 roadmap update this week. “Microsoft Teams can […]