CVE-2026-54701
Markdown Preview Enhanced is a Markdown preview extension for Visual Studio Code.
Published Oct 14, 2026 · updated Oct 14, 2026
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.
Code
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Timeline
Detection, updates, and resolution for this record.
Oct 14, 2026 · NIST NVD
Detected
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 Reac
Sources
- CVE.orgVulnerability recordCVE-2026-54701
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-54701
30-day exploitation probability 0.2%
first.org - NIST NVDVulnerability recordCVE-2026-54701
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 webvie
nvd.nist.gov