Microsoft Teams
Zoom Stealer browser extensions harvest corporate meeting intelligence
A newly discovered campaign, which researchers call Zoom Stealer, is affecting 2.2 million Chrome, Firefox, and Microsoft Edge users through 18 extensions that collect online meeting-related data like URLs, IDs, topics, descriptions, and embedded passwords. Zoom Stealer is one of three browser extension campaigns that reached more than 7.8 million users over seven years and […]
Microsoft Teams to let admins block external users via Defender portal
Microsoft announced that security administrators will soon be able to block external users from sending messages, calls, or meeting invitations to members of their organization via Teams. The new feature will start rolling out in early January, integrating Microsoft Teams with Defender for Office 365, and enabling admins to manage blocked external contacts through the […]
Microsoft Teams strengthens messaging security by default in January
Microsoft announced that Teams will automatically enable messaging safety features by default to strengthen defenses against content tagged as malicious. The change will roll out starting January 12, 2026, to tenants still using the default configuration and who haven’t previously modified messaging safety settings. “We’re improving messaging security in Microsoft Teams by enabling key safety […]
Microsoft confirms Teams is down and messages are delayed
Microsoft Teams is experiencing issues, with thousands reporting problems sending messages, including delays. The outage started at 14:30PM ET, and it’s affecting users in all regions, including the United States and Europe. In a post on X, Microsoft confirmed it’s investigating an issue affecting Teams and will share an update soon. “We’re investigating an issue […]
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. […]