CRITICAL 9.8 Microsoft
CVE-2026-66302
Skype for Business Remote Code Execution Vulnerability
Microsoft Security Update 2026-Sep: Skype for Business Remote Code Execution Vulnerability
Affected Products
- Skype for Business Server 2019 CU8
- Skype for Business Server Subscription Edition CU1
- Skype for Business Server 2015 CU13
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66302
- https://nvd.nist.gov/vuln/detail/CVE-2026-66302
This critical severity vulnerability with a CVSS score of 9.8 was published on 2026-09-08 via Microsoft. Affected: Skype for Business Server 2019 CU8, Skype for Business Server Subscription Edition CU1, Skype for Business Server 2015 CU13.
Risk Timeline
CVE Disclosed2026-09-08 · 48 days ago
Remediation Resources
Official Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66302NVD / MITRE
nvd.nist.gov/vuln/detail/CVE-2026-66302Related Vulnerabilities
| CVE | Title | Severity | CVSS |
|---|---|---|---|
| CVE-2026-70297 | Skype for Business Remote Code Execution Vulnerability | HIGH | 8.8 |
| CVE-2026-69646 | Skype for Business Spoofing Vulnerability | HIGH | 8.3 |
| CVE-2026-83746 | Skype for Business Elevation of Privilege Vulnerability | HIGH | 8.1 |
| CVE-2026-66304 | Skype for Business Information Disclosure Vulnerability | HIGH | 7.5 |
| CVE-2026-66307 | Skype for Business and Lync Denial of Service Vulnerability | HIGH | 7.5 |
| CVE-2026-66305 | Skype for Business Spoofing Vulnerability | HIGH | 7.1 |
vulnfeed aggregates 18513 vulnerabilities from NVD, CISA KEV,
Ubuntu, Debian, Red Hat, Kubernetes, Exploit-DB, OSS-Security, GitHub and OpenStack — updated every 4 hours.