Home/CVE/Use after free in Windows Clipboard Server allows an unauthorized attacker to elevate privileges locally.
CVE

CVE-2026-20844

Use after free in Windows Clipboard Server allows an unauthorized attacker to elevate privileges locally.

Use after free in Windows Clipboard Server allows an unauthorized attacker to elevate privileges locally.

HIGH · CVSS 7.4 EPSS 0.00035
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
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Weakness Classification

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416Use After Free
▤

Affected Products & Versions

12
microsoft windows 10 1607< 10.0.14393.8783
microsoft windows 10 1809< 10.0.17763.8276
microsoft windows 10 21h2< 10.0.19044.6809
microsoft windows 10 22h2< 10.0.19045.6809
microsoft windows 11 23h2< 10.0.22631.6491
microsoft windows 11 24h2< 10.0.26100.7623
microsoft windows 11 25h2< 10.0.26200.7623
microsoft windows server 2016< 10.0.14393.8783
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Scoring & Timeline

7.4
HIGH · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD13 Jan 2026 · 06:16 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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Vendor Advisories

1
msrcCVE-2026-20844Elevation of Privilege
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