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CVE-2026-49493— Markdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS()

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 0.8.28之前版本存在代码注入漏洞，该漏洞源于使用interpretJS解析Bitfield围栏代码块并执行代码，可能导致任意代码执行。

CVSS 8.8 · High EPSS 0.56% · P46

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
shd101wyy Markdown Preview Enhanced < 0.8.28 affected
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I. Basic Information for CVE-2026-49493

Vulnerability Information
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Vulnerability Title
Markdown Preview Enhanced Arbitrary Code Execution via Bitfield interpretJS()
Source: CVE Program / CVE List V5
Vulnerability Description
Markdown Preview Enhanced before 0.8.28 parses Bitfield fenced code blocks with interpretJS(), which evaluates the block content as code via vm.runInNewContext(), allowing arbitrary code execution. A crafted markdown document containing a malicious bitfield code block executes attacker-controlled code on the server side when the document is rendered or exported. Fixed in 0.8.28 by parsing bitfield register definitions with JSON5.parse(), since they are purely data.
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
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Markdown Preview Enhanced 代码注入漏洞
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之前版本存在代码注入漏洞，该漏洞源于使用interpretJS解析Bitfield围栏代码块并执行代码，可能导致任意代码执行。
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 ~ 0.8.28 -

II. Public POCs for CVE-2026-49493

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 10175 chars
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Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-49493

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Vendor Advisories for CVE-2026-49493 (1)

Vendor Pages for CVE-2026-49493 (1)

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

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()
CVE-2026-11422 7.1 HIGH Markdown Preview Enhanced 0.8.x Code Injection via WaveDrom Rendering

IV. Related Vulnerabilities

Same product: Markdown Preview Enhanced
Same vendor: shd101wyy
Same weakness: CWE-94

V. Comments for CVE-2026-49493

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