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

Note Mark has Stored XSS via Unrestricted Asset Upload

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Note Mark 安全漏洞

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。

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