Patch tracker / Products / Skype for Business Server Subscription Edition CU1

Skype for Business Server Subscription Edition CU1: vulnerabilities and security updates

Every CVE affecting Skype for Business Server Subscription Edition CU1 and the Microsoft update (KB) that fixes it, ranked by real-world risk. Actively exploited (CISA KEV) first, then EPSS exploit probability, on top of CVSS severity.

CVEs
10
Updates (KBs)
1
Actively exploited (KEV)
0
Critical Severity
1

CVEs affecting Skype for Business Server Subscription Edition CU1

CVESeverityCVSSEPSSStatus
CVE-2026-66302Critical9.81.2%-
CVE-2026-69646High8.31.2%-
CVE-2026-66304High7.51.2%-
CVE-2026-66307High7.51.2%-
CVE-2026-66305High7.11.2%-
CVE-2026-63523Medium6.51.2%-
CVE-2026-66303Medium6.51.2%-
CVE-2026-66306Medium6.51.2%-
CVE-2026-66308Medium6.51.2%-
CVE-2026-69642Medium6.51.2%-

Updates (KBs) for Skype for Business Server Subscription Edition CU1

UpdateReleasedSeverityCVSSEPSSCVEsStatus
KB51232872026-09-08Critical9.81.2%10-

Ranked across all products on the Microsoft patch tracker and the CVE and vulnerability management reference. Browse every product: product index.

Most searched on Senserva right now

KB5122876 install notes and severity KB5126052: the full CVE list KB5122882: patch details KB5120708: patch details KB5123099 install notes and severity KB5122871 install notes and severity KB5120238 install notes and severity KB5122878: patch details KB5129235 download and what it fixes KB5120994 install notes and severity
New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
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