CVE-2026-26174: Windows Server Update Service (WSUS) Elevation of Privilege Vulnerability
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Server Update Service allows an authorized attacker to elevate privileges locally.
Other sources
Windows Server Update Service (WSUS) Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.28000.1836Patch KB5083768 - Upgrade
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Fixed in 6.2.9200.26026Patch KB5082127 - Upgrade
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Fixed in 10.0.14393.9060Patch KB5082198 - Upgrade
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Fixed in 6.3.9600.23132Patch KB5082126 - Upgrade
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Fixed in 10.0.26100.32690Patch KB5082063 - Upgrade
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Fixed in 10.0.26100.8246Patch KB5083769 - Upgrade
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Fixed in 10.0.26200.8246Patch KB5083769 - Upgrade
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Fixed in 10.0.22631.6936Patch KB5082052 - Upgrade
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Fixed in 10.0.25398.2274Patch KB5082060 - Upgrade
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Fixed in 10.0.19045.7184Patch KB5082200 - Upgrade
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Fixed in 10.0.20348.5020Patch KB5082142 - Upgrade
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Fixed in 10.0.19044.7184Patch KB5082200 - Upgrade
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Fixed in 10.0.17763.8644Patch KB5082123
Event History
Frequently Asked Questions
What is the severity of CVE-2026-26174?
CVE-2026-26174 has a high severity rating due to its potential to allow privilege escalation for local users.
How do I fix CVE-2026-26174?
To fix CVE-2026-26174, apply the relevant security updates provided by Microsoft for your affected version of WSUS.
Which systems are affected by CVE-2026-26174?
CVE-2026-26174 affects several versions of Windows Server Update Services, including Windows Server 2012, 2016, 2019, and various versions of Windows 10 and 11.
What type of vulnerability is CVE-2026-26174?
CVE-2026-26174 is classified as an Elevation of Privilege vulnerability caused by improper synchronization in shared resources.
Can I mitigate CVE-2026-26174 without applying a patch?
It is recommended to apply the security patches as the primary method of mitigation for CVE-2026-26174, as workarounds may not fully protect against exploitation.