CVE-2026-66305
Skype for Business Spoofing vulnerability
MSRC advisory September 8, 2026
Alert details
- Source feed
- Microsoft MSRC
- CVE ID
- CVE-2026-66305
- Affected products
- Skype for Business Spoofing · Microsoft Skype for Business Spoofing · Microsoft
What happened
Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.
What it means for your business
Skype for Business Spoofing vulnerability (CVE-2026-66305) was added to Microsoft’s security update guidance. Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network. If you need help checking exposure, call (864) 335-9223.
Sources
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