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Recorded 20 Oct 2026 at 20:53 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

CVEMicrosoft Security Response Center

Windows Kernel Security Feature Bypass Vulnerability

Weak authentication in Windows Kernel allows an authorized attacker to bypass a security feature over a network.

Cite this recorded revision

What it said

CVE
CVE-2026-85939
Severity
Important
CVSS base score
5.3
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C
Impact
Security Feature Bypass
Exploitation detected
Not reported by MSRC
Publicly disclosed
No
Exploitability
Exploitation Less Likely
Component
Windows Kernel
Weakness
CWE-1390: Weak Authentication
Issued by
Microsoft
Customer action
Required: apply the update
Affected products
Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems, Windows 11 Version 26H2 for ARM64-based Systems, Windows 11 Version 26H2 for x64-based Systems, Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022 (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)
Updates that fix it
KB5126646: Windows Server 2025, Windows Server 2025 (Server Core installation) (restart required); KB5126651: Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems, Windows Server 2019, Windows Server 2019 (Server Core installation) (restart required); KB5126653: Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems (restart required); KB5126655: Windows Server 2022, Windows Server 2022 (Server Core installation) (restart required); KB5126657: Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 22H2 for x64-based Systems (restart required); KB5126868: Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems, Windows Server 2016, Windows Server 2016 (Server Core installation) (restart required); KB5127646: Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems (restart required); KB5127648: Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 26H2 for ARM64-based Systems, Windows 11 Version 26H2 for x64-based Systems (restart required)
CISA KEV
Not listed in the collected catalog
EPSS
0.4%; scored 20 Oct 2026
Public exploit code
No Nuclei template listed
Published
13 Oct 2026 07:00 UTC
Last revised
13 Oct 2026 07:00 UTC
Revision note
Information published.

Source evidence when recorded

Microsoft security releases
Complete at observationRead 20 Oct 2026 at 20:53 UTC
CISA KEV
Complete at observationRead 20 Oct 2026 at 20:53 UTC
FIRST EPSS
Complete at observationRead 20 Oct 2026 at 20:53 UTC
Public exploit code
Complete at observationRead 20 Oct 2026 at 20:53 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

What changed

First observed 14 Oct 2026
  1. 20 Oct 2026 · 20:53:31 UTC EPSS0.4%; scored 19 Oct 2026 → 0.4%; scored 20 Oct 2026
  2. 19 Oct 2026 · 15:12:40 UTC EPSS0.4%; scored 18 Oct 2026 → 0.4%; scored 19 Oct 2026
  3. 18 Oct 2026 · 14:54:30 UTC EPSS0.4%; scored 16 Oct 2026 → 0.4%; scored 18 Oct 2026
  4. 18 Oct 2026 · 14:54:30 UTC Link: October 2026/security?release=2026-Oct#cves
  5. 16 Oct 2026 · 16:13:25 UTC EPSS0.4%; scored 15 Oct 2026 → 0.4%; scored 16 Oct 2026
  6. 15 Oct 2026 · 21:30:54 UTC EPSS0.4%; scored 14 Oct 2026 → 0.4%; scored 15 Oct 2026
  7. 15 Oct 2026 · 01:07:54 UTC EPSSNot scored → 0.4%; scored 14 Oct 2026

The most recent 100 field changes are listed. Complete recorded revisions are kept separately.

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ChangeIntel

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Sources read 25 Oct 21:06 UTC · 271 of 271 readable · 269 fully read · documentation 464/464 current

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