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CVE-2026-40262— Note Mark has Stored XSS via Unrestricted Asset Upload

Quick assessment

Affected
enchant97 note-mark
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Note Mark是Leo Spratt个人开发者的一个基于网络的Markdown笔记应用程序。 Note Mark 0.19.1及之前版本存在安全漏洞，该漏洞源于资产交付处理程序内联提供上传的文件并依赖魔术字节检测内容类型，可能导致经过身份验证的用户上传包含JavaScript的HTML或SVG文件并在受害者访问资产URL时执行脚本。

CVSS 8.7 · High EPSS 0.42% · P34
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I. Basic Information for CVE-2026-40262

Vulnerability Information
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Vulnerability Title
Note Mark has Stored XSS via Unrestricted Asset Upload
Source: CVE Program / CVE List V5
Vulnerability Description
Note Mark is an open-source note-taking application. In versions 0.19.1 and prior, the asset delivery handler serves uploaded files inline and relies on magic-byte detection for content type, which does not identify text-based formats such as HTML, SVG, or XHTML. These files are served with an empty Content-Type, no X-Content-Type-Options: nosniff header, and inline disposition, allowing browsers to sniff and render active content. An authenticated user can upload an HTML or SVG file containing JavaScript as a note asset, and when a victim navigates to the asset URL, the script executes under the application's origin with access to the victim's authenticated session and API actions. This issue has been fixed in version 0.19.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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
Note Mark 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Note Mark是Leo Spratt个人开发者的一个基于网络的Markdown笔记应用程序。 Note Mark 0.19.1及之前版本存在安全漏洞，该漏洞源于资产交付处理程序内联提供上传的文件并依赖魔术字节检测内容类型，可能导致经过身份验证的用户上传包含JavaScript的HTML或SVG文件并在受害者访问资产URL时执行脚本。
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
enchant97 note-mark < 0.19.2 -

II. Public POCs for CVE-2026-40262

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III. Intelligence Information for CVE-2026-40262

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Vendor Advisories for CVE-2026-40262 (1)

Same Patch Batch · enchant97 · 2026-04-16 · 3 CVEs total

CVE-2026-40265 5.9 MEDIUM Note Mark has Broken Access Control on Asset Download
CVE-2026-40263 3.7 LOW Note Mark: Username Enumeration via Login Endpoint Timing Side-Channel

IV. Related Vulnerabilities

Same product: note-mark
Same vendor: enchant97
Same weakness: CWE-79

V. Comments for CVE-2026-40262

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