Recorded 14 Oct 2026 at 11:22 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
Win32k Elevation of Privilege Vulnerability
Use after free in Windows Win32K allows an authorized attacker to elevate privileges locally.
What it said
- CVE
- CVE-2026-83721
- Severity
- Important
- CVSS base score
- 7.8
- CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Impact
- Elevation of Privilege
- Exploitation detected
- Not reported by MSRC
- Publicly disclosed
- No
- Exploitability
- Exploitation Less Likely
- Component
- Windows Win32K
- Weakness
- CWE-416: Use After Free
- Issued by
- Microsoft
- Customer action
- Required: apply the update
- Affected products
- 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 2025, Windows Server 2025 (Server Core installation)
- Updates that fix it
- KB5126646: Windows Server 2025, Windows Server 2025 (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
- Not scored
- 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.
Recorded links
Source evidence when recorded
- Microsoft security releases
- Complete at observationRead 14 Oct 2026 at 11:21 UTC
- CISA KEV
- Complete at observationRead 14 Oct 2026 at 11:21 UTC
- FIRST EPSS
- Complete at observationRead 14 Oct 2026 at 11:21 UTC
- Public exploit code
- Complete at observationRead 14 Oct 2026 at 11:21 UTC
Coverage describes the sources at this observation. A complete read then does not establish their current position.
What changed
First observed 14 Oct 2026No field changes in the recorded history.
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