CVE-2026-54703
Markdown Preview Enhanced: Arbitrary File Write via updateMarkdown Command Without Path Validation
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.
| CWE | CWE-73 |
| Vendor | shd101wyy |
| Product | vscode-markdown-preview-enhanced |
| Published | Oct 14, 2026 |
Get instant alerts for shd101wyy vscode-markdown-preview-enhanced
Be the first to know when new unknown vulnerabilities affecting shd101wyy vscode-markdown-preview-enhanced are published — delivered to Slack, Telegram or Discord.