PT-2026-47053 · Shd101Wyy · Markdown Preview Enhanced+1

Published 2026-06-05 · Updated 2026-06-05 · CVE-2026-11422

Mitre

CVSS v3.1

7.1

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

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.

Fix

Eval Injection

Weakness Enumeration

CWE-95

Related Identifiers

CVE-2026-11422

Affected Products

Markdown Preview Enhanced

Crossnote

References · 5

• https://github.com/shd101wyy/vscode-markdown-preview-enhanced/commit/dcd80281c986293b93d9f1af34ced64dcb230c77 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-11422 · Security Note
• https://github.com/shd101wyy/crossnote/commit/5588ca2121c3da43fe331575dc5cf4ef347b91ee · Patch
• https://github.com/shd101wyy/vscode-markdown-preview-enhanced/issues/2315 · Note
• https://vulncheck.com/advisories/markdown-preview-enhanced-x-code-injection-via-wavedrom-rendering · Note