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CVE-2021-47837— Markdownify 1.2.0 - Persistent Cross-Site Scripting

Quick assessment

Affected
amitmerchant1990 Markdownify
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.

Markdownify是Amit Merchant个人开发者的一个基于 Electron 构建的最小 Markdown Editor 桌面应用程序。 Markdownify 1.2.0版本存在安全漏洞，该漏洞源于markdown文件存在存储型跨站脚本，可能导致远程代码执行。

CVSS 7.2 · High EPSS 0.42% · P35
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I. Basic Information for CVE-2021-47837

Vulnerability Information
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Vulnerability Title
Markdownify 1.2.0 - Persistent Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
Markdownify 1.2.0 contains a persistent cross-site scripting vulnerability that allows attackers to store malicious payloads within markdown files. Attackers can upload crafted markdown files with embedded scripts that execute when the file is opened, potentially enabling remote code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Markdownify 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Markdownify是Amit Merchant个人开发者的一个基于 Electron 构建的最小 Markdown Editor 桌面应用程序。 Markdownify 1.2.0版本存在安全漏洞，该漏洞源于markdown文件存在存储型跨站脚本，可能导致远程代码执行。
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
amitmerchant1990 Markdownify 1.2.0 -

II. Public POCs for CVE-2021-47837

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 4612 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2021-47837

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IV. Related Vulnerabilities

Same product: Markdownify
Same weakness: CWE-79

V. Comments for CVE-2021-47837

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