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Recorded 10 Nov 2026 at 18:32 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

Microsoft Trace Data Helper Elevation of Privilege Vulnerability

Heap-based buffer overflow in Microsoft Trace Data Helper allows an authorized attacker to elevate privileges locally.

What it said

CVE
CVE-2026-121681
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
No known exploitation (MSRC assessment)
Publicly disclosed
No (MSRC assessment)
Exploitability
Exploitation Less Likely
Component
Microsoft Trace Data Helper
Weakness
CWE-122: Heap-based Buffer Overflow
Issued by
Microsoft
Customer action
Required: follow the MSRC remediation guidance
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
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); KB5131080: Windows Server 2025, Windows Server 2025 (Server Core installation) (restart required)
CISA KEV
Not listed in the collected catalog
EPSS
No EPSS score collected
Public detection template
No Nuclei template listed
Published
10 Nov 2026 08:00 UTC
Last revised
10 Nov 2026 08:00 UTC
Revision note
Information published.

Source evidence when recorded

Microsoft security releases
Complete at observationRead 10 Nov 2026 at 18:30 UTC
CISA KEV
Complete at observationRead 10 Nov 2026 at 18:30 UTC
FIRST EPSS
Complete at observationRead 10 Nov 2026 at 18:30 UTC
Public detection templates (Nuclei)
Complete at observationRead 10 Nov 2026 at 18:30 UTC

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

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ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 10 Nov 20:19 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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