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CVE PROGRAM SOURCE RECORD5.8 Medium

CVE-2026-54703

Markdown Preview Enhanced: Arbitrary File Write via updateMarkdown Command Without Path Validation

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

Markdown Preview Enhanced is a Markdown preview extension for Visual Studio Code. Prior to 0.8.30, the _crossnote.updateMarkdown command in Markdown Preview Enhanced accepts an arbitrary URI and attacker-controlled content, then passes them to vscode.workspace.fs.writeFile without validating that the target is the Markdown file represented by the current preview. JavaScript already executing in the preview webview can invoke this command through the extension message bridge and write any file permitted by the VS Code user's operating-system privileges, including user configuration, startup, source, and build files. This file-write vulnerability requires a separate webview JavaScript execution path, such as the independently tracked head.html injection and blind command-dispatch weaknesses. This issue is fixed in version 0.8.30.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

shd101wyy vscode-markdown-preview-enhanced

  • < 0.8.30affected

References