CVE-2026-20856
moderate-risk
Published 2026-01-13
Improper input validation in Windows Server Update Service allows an unauthorized attacker to execute code over a network.
Do I need to act?
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0.13% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.1/10
High
NETWORK
/ HIGH complexity
Affected Products (16)
Affected Vendors
References (1)
43
/ 100
moderate-risk
Severity
24/34 · High
Exploitability
1/34 · Minimal
Exposure
18/34 · Moderate