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CVE-2026-50733— Markdown Preview Enhanced Arbitrary Code Execution via WaveDrom eval()

CVSS 8.8 · High EPSS 0.36% · P29

Affected Version Matrix 1

VendorProductVersion RangeStatus
shd101wyyMarkdown Preview Enhanced< 0.8.28affected
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I. Basic Information for CVE-2026-50733

Vulnerability Information
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Vulnerability Title
Markdown Preview Enhanced Arbitrary Code Execution via WaveDrom eval()
Source: CVE Program / CVE List V5
Vulnerability Description
Markdown Preview Enhanced before 0.8.28 parses WaveDrom diagrams by evaluating untrusted markdown content with eval(), allowing arbitrary JavaScript execution. The flaw affects every render path - the live preview (window.eval) and presentation mode plus HTML export (the bundled WaveDrom.ProcessAll()/eva() helpers) - and can also be triggered through a <script type="WaveDrom"> element injected via raw HTML in markdown. When a victim previews or exports a crafted markdown document, an attacker can execute arbitrary code, leading to arbitrary file write. Fixed in 0.8.28 by parsing with JSON5.parse() and sanitizing WaveDrom data scripts to inert strict JSON.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 0.8.28之前版本存在安全漏洞，该漏洞源于通过eval()解析不受信任的markdown内容中的WaveDrom图，可能导致任意JavaScript执行，进而导致任意文件写入。
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

VendorProductAffected VersionsCPESubscribe
shd101wyyMarkdown Preview Enhanced 0 ~ 0.8.28 -

II. Public POCs for CVE-2026-50733

#POC DescriptionSource LinkShenlong Link
AI-Generated POCVerified env Premium
Qwen3.6-35B-A3B · 10250 chars
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III. Intelligence Information for CVE-2026-50733

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Vendor Advisories for CVE-2026-50733 (1)

Proof of Concept for CVE-2026-50733 (1)

Vendor Pages for CVE-2026-50733 (1)

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

CVE-2026-494938.8 HIGHMarkdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS()
CVE-2026-494928.8 HIGHMarkdown Preview Enhanced OS Command Injection in External File and Link Opening
CVE-2026-114227.1 HIGHMarkdown Preview Enhanced 0.8.x Code Injection via WaveDrom Rendering

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-50733

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