CVE-2026-20834 Details
Description
Absolute path traversal in Windows Shell allows an unauthorized attacker to perform spoofing with a physical attack.
A vulnerability allowing absolute path traversal in Windows Shell has been identified. This issue enables an unauthorized attacker to perform spoofing, but requires a physical attack. The vulnerability affects multiple Windows Server and Windows 10 versions.
Users can apply the security update available through the Microsoft Update Catalog. Specific update details can be found in the Microsoft Knowledge Base articles linked in the 'Security Updates' section.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jan 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20834 | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-359 | Exposure of Private Personal Information to an Unauthorized Actor | [email protected] |
| CWE-36 | Absolute Path Traversal | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft windows 10 1607 | < 10.0.14393.8783 |
CPE
Remediation
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| microsoft windows 10 1809 | < 10.0.17763.8276 |
CPE
Remediation
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| microsoft windows 10 21h2 | < 10.0.19044.6809 |
CPE
Remediation
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| microsoft windows 10 22h2 | < 10.0.19045.6809 |
CPE
Remediation
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| microsoft windows 11 23h2 | < 10.0.22631.6491 |
CPE
Remediation
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| microsoft windows 11 24h2 | < 10.0.26100.7623 |
CPE
Remediation
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| microsoft windows 11 25h2 | < 10.0.26200.7623 |
CPE
Remediation
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| microsoft windows server 2008 | r2 sp1 |
CPE
Remediation
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| microsoft windows server 2012 | r2 |
CPE
Remediation
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| microsoft windows server 2016 | < 10.0.14393.8783 |
CPE
Remediation
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| microsoft windows server 2019 | < 10.0.17763.8276 |
CPE
Remediation
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| microsoft windows server 2022 | < 10.0.20348.4648 |
CPE
Remediation
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| microsoft windows server 2022 23h2 | < 10.0.25398.2092 |
CPE
Remediation
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| microsoft windows server 2025 | < 10.0.26100.32230 |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 30, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jan 15, 2026 | Initial Analysis | [email protected] |
| Jan 13, 2026 | New CVE Received | [email protected] |