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

Quick assessment

Affected
shd101wyy Markdown Preview Enhanced
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Markdown Preview Enhanced是Yiyi Wang个人开发者的一个超级强大标记扩展。 Markdown Preview Enhanced 0.8.x版本存在安全漏洞，该漏洞源于WaveDrom渲染管道中代码注入，导致攻击者通过嵌入恶意内容执行任意JavaScript。

CVSS 7.1 · High EPSS 0.16% · P5

Affected Version Matrix 2

VendorProduct Version RangeStatus
shd101wyy crossnote < 0.9.28 affected
shd101wyy Markdown Preview Enhanced < 0.8.27 affected
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I. Basic Information for CVE-2026-11422

Vulnerability Information
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Vulnerability Title
Markdown Preview Enhanced 0.8.x Code Injection via WaveDrom Rendering
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
动态执行代码中指令转义处理不恰当(Eval注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Markdown Preview Enhanced 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Markdown Preview Enhanced是Yiyi Wang个人开发者的一个超级强大标记扩展。 Markdown Preview Enhanced 0.8.x版本存在安全漏洞，该漏洞源于WaveDrom渲染管道中代码注入，导致攻击者通过嵌入恶意内容执行任意JavaScript。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
shd101wyy Markdown Preview Enhanced 0 ~ 0.8.27 -
shd101wyy crossnote 0 ~ 0.9.28 -

II. Public POCs for CVE-2026-11422

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7617 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
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III. Intelligence Information for CVE-2026-11422

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Patches & Fixes for CVE-2026-11422 (1)

Vendor Advisories for CVE-2026-11422 (1)

Proof of Concept for CVE-2026-11422 (1)

Same Patch Batch · shd101wyy · 2026-06-05 · 4 CVEs total

CVE-2026-49493 8.8 HIGH Markdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS()
CVE-2026-49492 8.8 HIGH Markdown Preview Enhanced OS Command Injection in External File and Link Opening
CVE-2026-50733 8.8 HIGH Markdown Preview Enhanced Arbitrary Code Execution via WaveDrom eval()

IV. Related Vulnerabilities

Same product: Markdown Preview Enhanced
Same vendor: shd101wyy
Same weakness: CWE-95

V. Comments for CVE-2026-11422

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