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Vulnerability Intelligence

CVE-2026-20856

HIGH8.1

Windows Server Update Service (WSUS) Remote Code Execution Vulnerability

Published Jan 13, 2026

Modified 2 days ago

No fix available

References

ADVISORYhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20856 ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2026-20856

CVSS Analysis

CVSS v3.1

8.1

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

HighAC:H

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

HighA:H

8.1/CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Weakness Type (CWE)

Input Validation

Improper Input Validation

Ecosystems

Timeline

PublishedJan 13, 2026

ModifiedJan 14, 2026

CVE-2026-20856 | Mondoo Vulnerability Intelligence