Use of externally-controlled format string in Windows NTFS allows an authorized attacker to elevate privileges locally.
Fix
Microsoft's update · Important
- KB5127648 — Windows 11 Version 26H2 · build 10.0.26300.9711 · restart required
- KB5126651 — Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809, Windows Server 2019, Windows Server 2019 (Server Core installation) · build 10.0.17763.9376 · restart required
- KB5126655 — Windows Server 2022, Windows Server 2022 (Server Core installation) · build 10.0.20348.5761 · restart required
- KB5126657 — Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 · build 10.0.19044.7807 · restart required
- KB5126657 — Windows 10 Version 22H2, Windows 10 Version 22H2 for 32-bit Systems · build 10.0.19045.7807 · restart required
- KB5126646 — Windows Server 2025 (Server Core installation), Windows Server 2025 · build 10.0.26100.33650 · restart required
- KB5127648 — Windows 11 Version 25H2 · build 10.0.26200.9711 · restart required
- KB5126653 — Windows 11 Version 23H2 · build 10.0.22631.7652 · restart required
- KB5127648 — Windows 11 Version 24H2 · build 10.0.26100.9711 · restart required
- KB5127646 — Windows 11 version 26H1, Windows 11 Version 26H1 · build 10.0.28000.3231 · restart required
- KB5126868 — Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607, Windows Server 2016, Windows Server 2016 (Server Core installation) · build 10.0.14393.9612 · restart required
- KB5126835 — Windows Server 2012, Windows Server 2012 (Server Core installation) · build 6.2.9200.26434 · restart required
- KB5126836 — Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation) · build 6.3.9600.23470 · restart required
From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-28 · Exploitation Unlikely.
Patch, vendor advisory and mitigation references on NVD 1
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83585 Patch, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 4
- Cpes+26 CPE criteria (now 26)NVD modified 2026-10-28 19:40
- StatusPublished → AnalyzedNVD modified 2026-10-28 19:40
- StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 19:37
- First seenCVSS 7.8NVD modified 2026-10-13 21:18
Affected (CPE criteria) 26
cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:arm64:*cpe:2.3:o:microsoft:windows_11_26h2:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:x64:*cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*
References 1
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83585 Patch, Vendor Advisory