CVE-2026-66302
Critical
Description
External control of file name or path in Skype for Business allows an unauthorized attacker to execute code over a network.
SeverityCritical
CVSS9.8
Exploit probability—
Product
Microsoft Skype For Business Server
PublishedSep 8, 2026
First seenSep 8, 2026
Weakness typeCWE-73CWE-73
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft skype_for_business_server | 2015, 2019 | — |
| microsoft skype_for_business_server_subscription_edition | 7.0.2046.849 | — |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.