Microsoft Teams
Microsoft says some users can’t open the Teams desktop client
Microsoft is working to resolve a known issue that causes delays or blocks some users from opening the Microsoft Teams desktop client on Windows systems. The company acknowledged this known issue (tracked as TM1466820) at 16:45 EDT on Thursday and advised affected customers to work around it by using the web or mobile platforms. “Specifically, when […]
Microsoft Teams, Outlook fail to launch on ARM-based Windows PCs
Microsoft is working to fix a known issue that causes crashes and launch failures for Microsoft Teams and New Outlook users after installing updates released since the August 2026 Patch Tuesday. These issues affect only ARM-based Windows devices like the Surface Laptop 7 and Surface Pro 11 that run Windows 11 24H2 or later, and […]
Microsoft Defender flags legitimate Google search links as malicious
Microsoft is investigating an issue causing the Defender for Office 365 security software to mistakenly flag legitimate Google search links as malicious. The company first acknowledged the incident (tracked under MO1465962) at 10:30 AM UTC and says affected users are seeing “Opening this website might not be safe” warnings when trying to open the blocked hyperlinks. […]
Microsoft Teams now lets admins block external bots from meetings
Microsoft is rolling out a new Teams meeting protection policy that allows administrators to automatically block all identified external bots from joining Teams meetings. This new feature builds on another Teams policy introduced in June that added smarter bot protection, ensuring all detected bots are tagged in the lobby and require organizer approval before joining. The […]
New SynkLoader malware pushed in Microsoft Teams phishing campaign
A previously unknown malware family dubbed SynkLoader is being distributed in Microsoft Teams phishing campaigns to steal credentials via a fake lock screen. The attacker impersonates the target company’s IT help desk, a tactic Microsoft highlighted earlier this year as increasingly common in multi-stage attacks. Expel’s security researcher Marcus Hutchins explains that the attacks direct the victim […]
Microsoft Teams vishing attacks lead to Chaos ransomware attacks
Threat actors are impersonating IT support staff in Microsoft Teams calls to gain remote access to corporate devices and deploy Chaos ransomware in attacks targeting North American organizations. Sophos tracks the campaign as STAC4749 and says it targeted dozens of organizations between February and June 2026. At least three of these intrusions led to the […]
Microsoft 365 outage affects Teams, SharePoint and other services
Microsoft is impacted by a massive outage affecting Teams and Microsoft 365 services, primarily affecting users in North America. At 11:11 AM ET on July 23, Downdetector recorded 2,403 reports, sharply above its normal baseline of 29. SharePoint accounted for 78% of the complaints, followed by Excel at 11% and the Microsoft 365 Admin Center at 6% […]
Fake IT support calls on Microsoft Teams push EtherRAT malware
Threat actors are abusing Microsoft Teams voice calls by impersonating corporate IT support staff to trick employees into installing the EtherRAT malware, giving attackers initial access to corporate networks. The campaign, reported by Palo Alto Networks’ Unit 42, combines phishing emails, Microsoft Teams voice calls, legitimate remote management tools, and a Node.js-based malware loader to […]
Microsoft adds smarter bot protection to Teams meetings
Microsoft has introduced a new Teams admin policy that allows organizers to prevent third-party bots from joining meetings without approval. This new feature was first announced in a March Microsoft 365 roadmap entry, when Microsoft said that it would be available across Windows, macOS, Android, and iOS platforms for worldwide standard multi-tenant and GCC cloud environments. Once […]
Ransomware gang abuses Microsoft Teams relays to hide malicious traffic
DragonForce ransomware used a custom malware named ‘Backdoor.Turn’ to hide command-and-control traffic inside Microsoft Teams relay infrastructure. The backdoor abuses the Traversal Using Relays around NAT (TURN) protocol used by Microsoft Teams to distribute messages when a direct connection to the client is unavailable (e.g., clients on a private network). DragonForce is a ransomware operation active since […]