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Vulnerabilities

Vulnerability · CVE-2026-83499

Windows Server Update Service Elevation of Privilege Vulnerability

Published Oct 13, 2026 · catalog updated Oct 17, 2026 · Microsoft Windows 10 Version 1607

Check if you run it

No confirmed exploitation is on record for CVE-2026-83499. EPSS is 0.30%. Act only if a listed version of Microsoft Windows 10 Version 1607 is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.30%
Remediation
Advisory link
Affected products
vendor Microsoft Windows 10 Version 1607 · vendor Microsoft Windows 10 Version 1809 · vendor Microsoft Windows Server 2012 · vendor Microsoft Windows Server 2012 (Server Core installation) · vendor Microsoft Windows Server 2012 R2 · vendor Microsoft Windows Server 2012 R2 (Server Core installation)

Insufficient granularity of access control in Windows Server Update Service allows an authorized attacker to elevate privileges locally.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Microsoft Windows 10 Version 1607version unspecified
  • vendor Microsoft Windows 10 Version 1809version unspecified
  • vendor Microsoft Windows Server 2012version unspecified
  • vendor Microsoft Windows Server 2012 (Server Core installation)version unspecified
  • vendor Microsoft Windows Server 2012 R2version unspecified
  • vendor Microsoft Windows Server 2012 R2 (Server Core installation)version unspecified
  • vendor Microsoft Windows Server 2016version unspecified
  • vendor Microsoft Windows Server 2016 (Server Core installation)version unspecified

How to fix CVE-2026-83499

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-83499. EPSS is 0.30%. Act only if a listed version of Microsoft Windows 10 Version 1607 is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-1220. EPSS 0.30%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Windows security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 17, 2026 · Tenable CVE Database

    Detected

    Insufficient granularity of access control in Windows Server Update Service allows an authorized attacker to elevate privileges locally.

  2. Oct 17, 2026 · CVE.org

    Updated

    Insufficient granularity of access control in Windows Server Update Service allows an authorized attacker to elevate privileges locally.

Sources

  • CVE.orgVulnerability recordCVE-2026-83499

    Insufficient granularity of access control in Windows Server Update Service allows an authorized attacker to elevate privileges locally.

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-83499

    30-day exploitation probability 0.3%

    first.org
  • Tenable CVE DatabaseVulnerability recordCVE-2026-83499

    Insufficient granularity of access control in Windows Server Update Service allows an authorized attacker to elevate privileges locally.

    tenable.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.