What’s Vulnerable › Vulnerabilities

CVE-2026-11422: Markdown Preview Enhanced 0.8.x Code Injection via WaveDrom Rendering

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-05 · updated 2026-07-23
• Weakness: CWE-95

Description

Markdown Preview Enhanced 0.8.x with crossnote engine 0.9.28 contains a code injection vulnerability in the WaveDrom rendering pipeline that allows attackers to execute arbitrary JavaScript by embedding malicious content in a wavedrom fenced code block within a crafted Markdown document. Attackers can exploit the unsanitized passing of wavedrom block content to window.eval() in the VS Code webview context to abuse the extension's message passing and invoke arbitrary file writes on the local filesystem.

Affected products

• shd101wyy crossnote: before 0.9.28 — fixed in 0.9.28
• shd101wyy Markdown Preview Enhanced: before 0.8.27 — fixed in 0.8.27

How to fix

Upgrade to a fixed version: shd101wyy crossnote 0.9.28; shd101wyy Markdown Preview Enhanced 0.8.27. Check the vendor advisory for mitigations.

References

• https://github.com/shd101wyy/crossnote/commit/5588ca2121c3da43fe331575dc5cf4ef347b91ee
• https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/dcd80281c986293b93d9f1af34ced64dcb230c77
• https://github.com/shd101wyy/vscode-markdown-preview-enhanced/issues/2315
• https://www.vulncheck.com/advisories/markdown-preview-enhanced-x-code-injection-via-wavedrom-rendering
• https://github.com/shd101wyy/vscode-markdown-preview-enhanced/issues/2315

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