shd101wyy vscode-markdown-preview-enhanced up to 0.8.29 Markdown Preview .crossnote/head.html resolvePathsInHeader injection

Summaryinfo

A vulnerability has been found in shd101wyy vscode-markdown-preview-enhanced up to 0.8.29 and classified as critical. The impacted element is the function resolvePathsInHeader of the file .crossnote/head.html of the component Markdown Preview. Performing a manipulation results in injection. This vulnerability is cataloged as CVE-2026-54701. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, was found in shd101wyy vscode-markdown-preview-enhanced up to 0.8.29. This affects the function resolvePathsInHeader of the file .crossnote/head.html of the component Markdown Preview. The manipulation with an unknown input leads to a injection vulnerability. CWE is classifying the issue as CWE-74. The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-54701 since 06/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1055 according to MITRE ATT&CK.

By approaching the search of inurl:.crossnote/head.html it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 0.8.30 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• shd101wyy

Name

• vscode-markdown-preview-enhanced

Version

• 0.8.0
• 0.8.1
• 0.8.2
• 0.8.3
• 0.8.4
• 0.8.5
• 0.8.6
• 0.8.7
• 0.8.8
• 0.8.9
• 0.8.10
• 0.8.11
• 0.8.12
• 0.8.13
• 0.8.14
• 0.8.15
• 0.8.16
• 0.8.17
• 0.8.18
• 0.8.19
• 0.8.20
• 0.8.21
• 0.8.22
• 0.8.23
• 0.8.24
• 0.8.25
• 0.8.26
• 0.8.27
• 0.8.28
• 0.8.29

Website

• Product: https://github.com/shd101wyy/vscode-markdown-preview-enhanced/

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