CVE-2026-54701

UNKNOWN 0.0

Markdown Preview Enhanced: Stored XSS via Unsanitized `.crossnote/head.html` Injection in Webview

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

Markdown Preview Enhanced is a Markdown preview extension for Visual Studio Code. Prior to 0.8.30, Markdown Preview Enhanced reads repository-controlled .crossnote/head.html content and passes it through resolvePathsInHeader before inserting it into the head of the preview webview document without removing executable content. Script-capable markup executes while the document loads, before the React application and DOMPurify initialize, and can access acquireVsCodeApi to send messages from the webview to the extension host. Opening a Markdown preview in a malicious repository is sufficient to trigger the injected content, and no additional click within the notification or preview is required. This issue is fixed in version 0.8.30.

CWE	CWE-79
Vendor	shd101wyy
Product	vscode-markdown-preview-enhanced
Published	Oct 14, 2026

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Affected Versions

shd101wyy / vscode-markdown-preview-enhanced

< 0.8.30

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/shd101wyy/vscode-markdown-preview-enhanced/security/advisories/GHSA-mcwg-4j78-qwv3 github.com: https://github.com/shd101wyy/crossnote/pull/444 github.com: https://github.com/shd101wyy/vscode-markdown-preview-enhanced/pull/2323 github.com: https://github.com/shd101wyy/crossnote/commit/8c55a2ba3365712a1caa4abeece0383bc2994d48 github.com: https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/8bc848b6cbb42b9f35a0f95f7c3bf29b8302970e github.com: https://github.com/shd101wyy/crossnote/releases/tag/0.9.31 github.com: https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.30