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CVE-2026-42090— Notesnook: RCE via stored XSS in note export rendering

CVSS 9.6 · Critical EPSS 0.17% · P38
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I. Basic Information for CVE-2026-42090

Vulnerability Information
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Vulnerability Title
Notesnook: RCE via stored XSS in note export rendering
Source: NVD (National Vulnerability Database)
Vulnerability Description
Notesnook is a note-taking app focused on user privacy & ease of use. Prior to Notesnook Web/Desktop version 3.3.15 and prior to Notesnook iOS/Android version 3.3.20, a stored XSS vulnerability in the note export flow can be escalated to remote code execution in the desktop app. The root cause is that exported note fields such as title, headline, and content are inserted into the generated HTML template without HTML escaping. When the note is later exported to PDF, Notesnook renders that HTML into a same-origin, unsandboxed iframe using iframe.srcdoc = .... Injected script executes in the Notesnook origin. In the desktop app, this becomes RCE because Electron is configured with nodeIntegration: true and contextIsolation: false. This issue has been patched in Notesnook Web/Desktop version 3.3.15 and Notesnook iOS/Android version 3.3.20.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
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 Web/Desktop 3.3.15之前版本和iOS/Android 3.3.20之前版本存在跨站脚本漏洞，该漏洞源于笔记导出流程中未对标题、摘要和内容等字段进行HTML转义，可能导致存储型跨站脚本攻击，在桌面应用中升级为远程代码执行。
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
streetwritersnotesnook Notesnook Web/Desktop < 3.3.15 -

II. Public POCs for CVE-2026-42090

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III. Intelligence Information for CVE-2026-42090

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IV. Related Vulnerabilities

Same product: notesnook
Same vendor: streetwriters
Same weakness: CWE-79

V. Comments for CVE-2026-42090

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