lowSecurity Advisories
Microsoft Teams to Let Admins Block Custom File Extensions to Harden Against Malware Delivery
New administrative control will allow organizations to tailor blocked file types beyond the default threat list, reducing malware risk in Teams collaboration.
CyberIntel Desk2 min read
Key Takeaways
- Microsoft Teams will allow admins to customize the list of blocked file extensions, moving beyond the default threat list.
- This feature helps organizations block custom file extensions that may be used in malware delivery, aligning with company-specific security policies.
- No active exploitation or CVE has been reported; the update is a proactive security enhancement.
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highCyber Attacks
Star Blizzard Campaign Targets 100+ Organizations with Fake Event Invitations
Microsoft reports that the Russian state-sponsored threat actor Star Blizzard has been conducting a sustained campaign since January 2026, using fake event invitations to trick targets into installing a backdoor on Windows computers. The operation has affected more than 100 organizations, primarily in the U.S. and U.K., with victims tied to Ukraine. At least one infection has been confirmed, though the full extent of breaches and data exfiltration remains unverified.
The Hacker News1 min read
