CVE-2026-54703
Severity not reportedMarkdown Preview Enhanced is a Markdown preview extension for Visual Studio Code.
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
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/8bc848b6cbb42b9f35a0f... security-advisories@github.com
- https://github.com/shd101wyy/vscode-markdown-preview-enhanced/pull/2323 security-advisories@github.com
- https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.30 security-advisories@github.com
- https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-82r... security-advisories@github.com
- https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-82r... 134c704f-9b21-4f2e-91b3-4a467353bcc0