shd101wyy Vscode Markdown Preview Enhanced up to 0.8.28 Configuration Evaluation .crossnote/config.js vm.runInNewContext os command injection

Summaryinfo

A vulnerability described as critical has been identified in shd101wyy Vscode Markdown Preview Enhanced up to 0.8.28. This affects the function vm.runInNewContext of the file .crossnote/config.js of the component Configuration Evaluation. Executing a manipulation can lead to os command injection. The identification of this vulnerability is CVE-2026-54566. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in shd101wyy Vscode Markdown Preview Enhanced up to 0.8.28. It has been declared as critical. This vulnerability affects the function vm.runInNewContext of the file .crossnote/config.js of the component Configuration Evaluation. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Markdown Preview Enhanced is a Markdown preview extension for Visual Studio Code. Prior to 0.8.29, Markdown Preview Enhanced evaluates repository-controlled .crossnote/config.js and .crossnote/parser.js files with vm.runInNewContext, which does not provide a security boundary from the Node.js host realm. Opening a Markdown file in a malicious repository automatically loads these files, and prototype-chain traversal can reach the host Function constructor and process object, allowing operating-system commands to execute as the victim account without further interaction. Both configuration evaluation and parser-hook evaluation are affected, and the attack does not depend on module-scoped require being available. This issue is fixed in version 0.8.29.

The advisory is available at github.com. This vulnerability was named CVE-2026-54566 since 06/15/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1202 by the MITRE ATT&CK project.

Upgrading to version 0.8.29 eliminates this vulnerability.

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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

CPE 2.3info

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CPE 2.2info

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