# CVE-2026-20834: Microsoft Windows Shell absolute path traversal

Source: https://junglewise.ai/threats/cve-2026-20834-microsoft-windows-shell-absolute-path-traversal  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-01-13. Updated: 2026-07-30  
License: CC BY 4.0 with a link back

CVE-2026-20834 · Severity: medium · CVSS 4.6 · Published 2026-01-13

A vulnerability in the Windows Shell component could allow an individual with physical access to a computer to view sensitive personal information. By exploiting how the system handles file paths, an attacker could bypass certain restrictions to spoof system elements or access data they should not be able to see. This requires the attacker to be physically present at the device, limiting the risk to lost or unattended hardware.

Technologies: [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11), [Microsoft Windows Server 2008 R2](https://junglewise.ai/threats/technologies/windows-server-2008-r2), [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-20834 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-20834 being exploited in the wild.

**How severe is CVE-2026-20834?** Medium severity, with a CVSS score of 4.6, published 13 January 2026.

**Which products and versions are affected?** Microsoft Windows 11 22H3, 23H2, 24H2, 25H2; Microsoft Windows Server 2008 R2 Service Pack 1; Microsoft Windows 10 1607, 1809, 21H2, 22H2.

**Is there a fix for CVE-2026-20834?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-20834 attacked?** It is attacked with physical access, in an operating system.

**Am I affected by CVE-2026-20834?** Check whether you run Microsoft Windows 11, Microsoft Windows Server 2008 R2 or Microsoft Windows 10 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An absolute path traversal vulnerability (CWE-36) exists in the Windows Shell component across multiple versions of Windows and Windows Server. The flaw allows an attacker with physical access to the target machine to manipulate file paths to access restricted information or perform spoofing attacks. According to the vendor, the vulnerability can lead to the exposure of private personal information (CWE-359). The attack vector is strictly physical (AV:P), meaning no remote exploitation is possible. Microsoft has released security updates to address this issue in the affected versions.

## Affected products

- Microsoft Windows 10 1607, 1809, 21H2, 22H2
- Microsoft Windows 11 22H3, 23H2, 24H2, 25H2
- Microsoft Windows Server 2008 R2 Service Pack 1

## Timeline

- 2026-01-13: disclosed
- 2026-01-13: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20834](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20834)

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