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CVE-2026-20856: WSUS Remote Code Execution Vulnerability Identified

First seen 13 Jan 2026, 20:07 UTC • •64

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ThreatCluster •March 12, 2026 at 13:27 UTC

A remote code execution vulnerability, identified as CVE-2026-20856, has been found in Windows Server Update Service (WSUS). This flaw arises from improper input validation, allowing unauthorized attackers to execute code over a network. Affected systems include those running WSUS, which is critical for managing updates in Windows environments.

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2 entities, 1 inferred relationships (STIX 2.1).

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Technique (1)

Remote Code Execution

Vulnerability (1)

CVE-2026-20856

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