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I. Basic Information for CVE-2026-31876
Vulnerability Information

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Vulnerability Title
Notesnook has Stored XSS via unsanitized Twitter/X embed URL in editor (`tweetToEmbed`)
Source: NVD (National Vulnerability Database)
Vulnerability Description
Notesnook is a note-taking app focused on user privacy & ease of use. Prior to 3.3.9, a Stored Cross-Site Scripting (XSS) vulnerability existed in Notesnook's editor embed component when rendering Twitter/X embed URLs. The tweetToEmbed() function in component.tsx interpolated the user-supplied URL directly into an HTML string without escaping, which was then assigned to the srcdoc attribute of an <iframe>. This vulnerability is fixed in 3.3.9.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
Vulnerability Title
Notesnook 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Notesnook是Streetwriters开源的一个端到端加密的笔记应用。 Notesnook 3.3.9之前版本存在跨站脚本漏洞,该漏洞源于编辑器嵌入组件对用户提供的URL处理不当,可能导致存储型跨站脚本攻击。
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
VendorProductAffected VersionsCPESubscribe
streetwritersnotesnook < 3.3.9 -
II. Public POCs for CVE-2026-31876
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III. Intelligence Information for CVE-2026-31876
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IV. Related Vulnerabilities
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