Microsoft Teams rolls out Brand Impersonation Protection for external call warnings
Security Tool/Service
Summary
Hide ▲
Show ▼
Microsoft Teams is adding Brand Impersonation Protection to warn users about suspicious first-time external callers, reducing social-engineering risk in call flows. The feature will roll out to the targeted release ring in mid-February and be enabled by default, expanding call-time protection without admin setup. Microsoft says the warnings are meant to flag calls that appear to impersonate trusted organizations before users answer.
Related Happenings
Microsoft Teams admin policy adds approval-based control for third-party bots
Security Tool/Service
H score11
First: 30.06.2026 13:52
Last: 30.06.2026 13:52
Sources 1
About this happening:
Microsoft Teams introduced an admin policy that lets organizers prevent third-party bots from joining meetings without approval. The control improves visibility over e...
Microsoft Teams admin policy adds approval-based control for third-party bots
Security Tool/ServiceAbout this happening: Microsoft Teams introduced an admin policy that lets organizers prevent third-party bots from joining meetings without approval. The control improves visibility over e...
Microsoft Teams third-party bot approval controls for meeting social-engineering risk
Defensive Guidance
H score11
First: 30.06.2026 13:52
Last: 30.06.2026 13:52
Sources 1
About this happening:
Microsoft Teams has added admin controls that block third-party bots without approval, reducing meeting social-engineering risk across managed tenants. The policy impr...
Microsoft Teams third-party bot approval controls for meeting social-engineering risk
Defensive GuidanceAbout this happening: Microsoft Teams has added admin controls that block third-party bots without approval, reducing meeting social-engineering risk across managed tenants. The policy impr...
KongTuke Microsoft Teams initial access campaign
Campaign
H score42
First: 14.05.2026 15:12
Last: 14.05.2026 15:12
Sources 1
About this happening:
The KongTuke campaign now uses Microsoft Teams social engineering to gain persistent access to corporate networks, shortening initial compromise to under five minute...
KongTuke Microsoft Teams initial access campaign
CampaignAbout this happening: The KongTuke campaign now uses Microsoft Teams social engineering to gain persistent access to corporate networks, shortening initial compromise to under five minute...
Microsoft Windows RDP security warning dialog rendering issue after April 2026 updates
Security Tool/Service
H score11
First: 28.04.2026 12:51
Last: 28.04.2026 12:51
Sources 1
About this happening:
Microsoft confirmed that newly introduced Windows security warnings for opening Remote Desktop (.rdp) files can display incorrectly, reducing users' ability to review...
Microsoft Windows RDP security warning dialog rendering issue after April 2026 updates
Security Tool/ServiceAbout this happening: Microsoft confirmed that newly introduced Windows security warnings for opening Remote Desktop (.rdp) files can display incorrectly, reducing users' ability to review...
Microsoft Edge regression disrupts Teams meeting joins
Service Disruption
H score1
First: 23.04.2026 16:18
Last: 23.04.2026 16:18
Sources 1
About this happening:
A Microsoft Edge regression is preventing some Windows users from joining Microsoft Teams meetings, causing a limited-scope access disruption for scheduled and link-ba...
Microsoft Edge regression disrupts Teams meeting joins
Service DisruptionAbout this happening: A Microsoft Edge regression is preventing some Windows users from joining Microsoft Teams meetings, causing a limited-scope access disruption for scheduled and link-ba...
Timeline
-
22.01.2026 18:28 2 articles · 5mo ago
Microsoft Teams rolls out Brand Impersonation Protection for external call warnings
Initial DisclosureMicrosoft is beginning a phased rollout of Brand Impersonation Protection for Teams calling. The first deployment starts in the targeted release ring in mid-February and turns the feature on by default.
Show sources
- Microsoft Teams to add brand impersonation warnings to calls — www.bleepingcomputer.com — 22.01.2026 18:28
- Microsoft Teams to add brand impersonation warnings to calls — www.bleepingcomputer.com — 22.01.2026 18:28