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TI-2026-21174 Aliases CVE-2026-26183GHSA-w9q8-v7fh-ff6x

Remote Access Management service/API (RPC server) Elevation of Privilege Vulnerability

Priority LOW 36CWE-284Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Microsoft. Impact type from Microsoft.

Summary

Improper access control in Windows RPC API allows an authorized attacker to elevate privileges locally.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00256 17th percentileScored 2026-11-07
Fix Fixed Microsoft: 7 updates

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftWindows Server 20126.2.9200.0 to before 6.2.9200.260266.2.9200.26026Patch availableCNA
MicrosoftWindows Server 2012 (Server Core installation)6.2.9200.0 to before 6.2.9200.260266.2.9200.26026Patch availableCNA
MicrosoftWindows Server 2012 R26.3.9600.0 to before 6.3.9600.231326.3.9600.23132Patch availableCNA
MicrosoftWindows Server 2012 R2 (Server Core installation)6.3.9600.0 to before 6.3.9600.231326.3.9600.23132Patch availableCNA
MicrosoftWindows Server 201610.0.14393.0 to before 10.0.14393.906010.0.14393.9060Patch availableCNA
MicrosoftWindows Server 2016 (Server Core installation)10.0.14393.0 to before 10.0.14393.906010.0.14393.9060Patch availableCNA
MicrosoftWindows Server 201910.0.17763.0 to before 10.0.17763.864410.0.17763.8644Patch availableCNA
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0 to before 10.0.17763.864410.0.17763.8644Patch availableCNA
MicrosoftWindows Server 202210.0.20348.0 to before 10.0.20348.502010.0.20348.5020Patch availableCNA
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0 to before 10.0.25398.227410.0.25398.2274Patch availableCNA
MicrosoftWindows Server 202510.0.26100.0 to before 10.0.26100.3269010.0.26100.32690Patch availableCNA
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0 to before 10.0.26100.3269010.0.26100.32690Patch availableCNA
  • Windows Server 2012 VendorMicrosoft Affected 6.2.9200.0 to before 6.2.9200.26026 Fixed in 6.2.9200.26026 Patch available CNA
  • Windows Server 2012 (Server Core installation) VendorMicrosoft Affected 6.2.9200.0 to before 6.2.9200.26026 Fixed in 6.2.9200.26026 Patch available CNA
  • Windows Server 2012 R2 VendorMicrosoft Affected 6.3.9600.0 to before 6.3.9600.23132 Fixed in 6.3.9600.23132 Patch available CNA
  • Windows Server 2012 R2 (Server Core installation) VendorMicrosoft Affected 6.3.9600.0 to before 6.3.9600.23132 Fixed in 6.3.9600.23132 Patch available CNA
  • Windows Server 2016 VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.9060 Fixed in 10.0.14393.9060 Patch available CNA
  • Windows Server 2016 (Server Core installation) VendorMicrosoft Affected 10.0.14393.0 to before 10.0.14393.9060 Fixed in 10.0.14393.9060 Patch available CNA
  • Windows Server 2019 VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.8644 Fixed in 10.0.17763.8644 Patch available CNA
  • Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.17763.0 to before 10.0.17763.8644 Fixed in 10.0.17763.8644 Patch available CNA
  • Windows Server 2022 VendorMicrosoft Affected 10.0.20348.0 to before 10.0.20348.5020 Fixed in 10.0.20348.5020 Patch available CNA
  • Windows Server 2022, 23H2 Edition (Server Core installation) VendorMicrosoft Affected 10.0.25398.0 to before 10.0.25398.2274 Fixed in 10.0.25398.2274 Patch available CNA
  • Windows Server 2025 VendorMicrosoft Affected 10.0.26100.0 to before 10.0.26100.32690 Fixed in 10.0.26100.32690 Patch available CNA
  • Windows Server 2025 (Server Core installation) VendorMicrosoft Affected 10.0.26100.0 to before 10.0.26100.32690 Fixed in 10.0.26100.32690 Patch available CNA

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*r2VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*before 10.0.14393.9060VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*before 10.0.17763.8644VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*before 10.0.20348.5020VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*before 10.0.25398.2274VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*before 10.0.26100.32690VulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Versions r2 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* Versions before 10.0.14393.9060 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* Versions before 10.0.17763.8644 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* Versions before 10.0.20348.5020 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:* Versions before 10.0.25398.2274 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* Versions before 10.0.26100.32690 Vulnerable ·Microsoft

Remediation

Microsoft 7 updates

  • KB5082198
    Security Update
    • Windows 10 Version 1607 for 32-bit Systems 10.0.14393.9060
    • Windows 10 Version 1607 for x64-based Systems 10.0.14393.9060
    • Windows Server 2016 10.0.14393.9060
    • Windows Server 2016 (Server Core installation) 10.0.14393.9060
  • KB5082142
    Security Update
    • Windows Server 2022 10.0.20348.5020
    • Windows Server 2022 (Server Core installation) 10.0.20348.5020
  • KB5082127
    Monthly Rollup
    • Windows Server 2012 6.2.9200.26026
    • Windows Server 2012 (Server Core installation) 6.2.9200.26026
Show 4 more Microsoft updates
  • KB5082126
    Monthly Rollup
    • Windows Server 2012 R2 6.3.9600.23132
    • Windows Server 2012 R2 (Server Core installation) 6.3.9600.23132
  • KB5082123
    Security Update
    • Windows 10 Version 1809 for 32-bit Systems 10.0.17763.8644
    • Windows 10 Version 1809 for x64-based Systems 10.0.17763.8644
    • Windows Server 2019 10.0.17763.8644
    • Windows Server 2019 (Server Core installation) 10.0.17763.8644
  • KB5082063
    Security Update
    • Windows Server 2025 10.0.26100.32690
    • Windows Server 2025 (Server Core installation) 10.0.26100.32690
  • KB5082060
    Security Update
    • Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2274

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Elevation of Privilege
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-26183
  2. 2026-10-03 Alias added: GHSA-w9q8-v7fh-ff6x

References

Patch 1

  • TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-01431 Netlogon Elevation of Privilege Vulnerability KEVCVSS 3.1CRITICAL 10.0
  • TI-2020-01310 Improper input validation in Microsoft Windows Server KEVCVSS 3.1CRITICAL 10.0
  • TI-2017-06077 Microsoft Windows XP SP3, Windows XP x64 XP2, Windows Server 2003 SP2, Windows Vista… KEVCVSS 3.1CRITICAL 9.8
  • TI-2015-01465 HTTP.sys in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8, Windows 8.1… KEVCVSS 3.1CRITICAL 9.8
  • TI-2020-01009 Improper input validation in Microsoft Windows Server KEVCVSS 3.1CRITICAL 9.0
See all 5293 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences