---
id: CVE-2026-49492
title: >-
  Markdown Preview Enhanced OS Command Injection in External File and Link
  Opening
summary: >-
  Markdown Preview Enhanced before 0.8.28 opens external files and links from
  the preview through a shell and does not validate untrusted inputs taken from
  the markdown document - the diagram filename attribute, imported file paths,
  and th…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-78
vendor: shd101wyy
product: Markdown Preview Enhanced
affected:
  - markdown_preview_enhanced < 0.8.28
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-06-08T16:13:18.480118Z'
exploitAvailable: true
published: '2026-06-05'
updated: '2026-11-08'
sourceUpdated: '2026-11-08T14:04:53.515Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-49492'
references:
  - url: >-
      https://github.com/shd101wyy/vscode-markdown-preview-enhanced/releases/tag/0.8.28
    label: Markdown Preview Enhanced 0.8.28 Release Notes
  - url: >-
      https://www.vulncheck.com/advisories/markdown-preview-enhanced-os-command-injection-in-external-file-and-link-opening
    label: >-
      VulnCheck Advisory: Markdown Preview Enhanced OS Command Injection in
      External File and Link Opening
tags:
  - cve.org
  - exploit-available
epss: 0.0034
epssPercentile: 0.27677
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/byte16384/CVE-2026-49492-PoC'
  checkedAt: '2026-11-08T14:51:57.340Z'
ingestedAt: '2026-11-08T14:51:22.388Z'
---

## Overview

Markdown Preview Enhanced before 0.8.28 opens external files and links from the preview through a shell and does not validate untrusted inputs taken from the markdown document - the diagram filename attribute, imported file paths, and the latex_engine code-chunk attribute. On Windows, a crafted markdown document can inject operating system commands that execute when the document is previewed. Fixed in 0.8.28 by passing these inputs as literal arguments instead of through a shell and validating them before use.

## Affected

- `markdown_preview_enhanced < 0.8.28`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.