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CVE-2021-47838— Markright 1.0 - Persistent Cross-Site Scripting

Quick assessment

Affected
dvcrn Markright
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.

markright是David个人开发者的一个Markdown编辑器。 markright 1.0版本存在安全漏洞，该漏洞源于允许在markdown文件中嵌入恶意有效载荷，可能导致远程代码执行。

CVSS 7.2 · High EPSS 0.42% · P34
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I. Basic Information for CVE-2021-47838

Vulnerability Information
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Vulnerability Title
Markright 1.0 - Persistent Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
Markright 1.0 contains a persistent cross-site scripting vulnerability that allows attackers to embed malicious payloads in markdown files. Attackers can upload specially crafted markdown files that execute arbitrary JavaScript when opened, potentially enabling remote code execution on the victim's system.
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
markright 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
markright是David个人开发者的一个Markdown编辑器。 markright 1.0版本存在安全漏洞，该漏洞源于允许在markdown文件中嵌入恶意有效载荷，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
dvcrn Markright 1.0 -

II. Public POCs for CVE-2021-47838

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 5360 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
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POC zip download
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III. Intelligence Information for CVE-2021-47838

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IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2021-47838

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