CVE-2026-54525

HighCVSS 8.8/10Last modified Oct 16, 2026

Description

Markdown Preview Enhanced is a Markdown preview extension for Visual Studio Code. Prior to 0.8.28, Markdown Preview Enhanced preview-link handling passes a decoded, Markdown-controlled link target to a Windows file-opening helper that invokes child_process.exec with the start command. When a Windows user opens an untrusted Markdown file and clicks a crafted external or unsupported-scheme link, shell metacharacters in the decoded target are interpreted by cmd.exe as command separators, allowing an attacker-selected command to run with the privileges of the current VS Code user. The attack requires one normal preview-link click but does not require malicious workspace configuration, script execution to be enabled, or additional files. This issue is fixed in version 0.8.28.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-78

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
shd101wyy	vscode-markdown-preview-enhanced	< 0.8.28

References

Timeline

Published: Oct 14, 2026
Last modified: Oct 16, 2026
NVD status: Awaiting Analysis

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