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High7.5Microsoft Server

High [CVE-2026-26154] Windows Server Update Service (WSUS) Tampering Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-26154 affecting Windows Server 2012 (Server Core installation), Windows Server 2012 R2 (Server Core installation), Windows Server 2016 (Server Core installation).

CVE-2026-26154 Published Apr 14, 2026Updated by vendor Aug 14, 2026
CVE-2026-26154
Affected products & platforms
Microsoft ServerWindows Server
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Summary

Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.

Affected products named by the advisory: Windows Server 2012; Windows Server 2012 (Server Core installation); Windows Server 2012 R2; Windows Server 2012 R2 (Server Core installation); and 8 more.

Affected products named by the advisory: Windows Server 2016 (Server Core installation); Windows Server 2019 (Server Core installation); Windows Server 2022, 23H2 Edition (Server Core installation); Windows Server 2025 (Server Core installation).

Affected versions
  • Windows Server 2012 6.2.9200.0 before 6.2.9200.26026
  • Windows Server 2012 (Server Core installation) 6.2.9200.0 before 6.2.9200.26026
  • Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.23132
  • Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 before 6.3.9600.23132
  • Windows Server 2016 10.0.14393.0 before 10.0.14393.9060
  • Windows Server 2016 (Server Core installation) 10.0.14393.0 before 10.0.14393.9060
  • Windows Server 2019 10.0.17763.0 before 10.0.17763.8644
  • Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.8644
  • Windows Server 2022 10.0.20348.0 before 10.0.20348.5020
  • Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 before 10.0.25398.2274
  • Windows Server 2025 10.0.26100.0 before 10.0.26100.32690
  • Windows Server 2025 (Server Core installation) 10.0.26100.0 before 10.0.26100.32690

Official advisory · high-confidence parse· fetched 3 hours ago·verify at source

Fixed versions
  • 6.2.9200.26026
  • 6.3.9600.23132
  • 10.0.14393.9060
  • 10.0.17763.8644
  • 10.0.20348.5020
  • 10.0.25398.2274
  • 10.0.26100.32690

Official advisory · high-confidence parse· fetched 3 hours ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.

Official advisory · high-confidence parse· fetched 3 hours ago·verify at source

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