CVE-2026-33955 json
Notesnook vulnerable to RCE via stored XSS in Note History diff viewer
published 2026-03-27 7 mo ago modified 2026-10-25 14 d ago also EUVD-2026-16872
- cvss
- 8.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
Notesnook is a note-taking app. Prior to version 3.3.11 on Web/Desktop, a cross-site scripting vulnerability stored in the note history comparison viewer can escalate to remote code execution in a desktop application. The issue is triggered when an attacker-controlled note header is displayed using `dangerouslySetInnerHTML` without secure handling. When combined with the full backup and restore feature in the desktop application, this becomes remote code execution because Electron is configured with `nodeIntegration: true` and `contextIsolation: false`. Version 3.3.11 patches the issue.
Patch / fix
- streetwriters notesnook_desktop 3.3.11
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.6 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
Affected products
- streetwriters Notesnook Web/Desktop
Classification
References
-
github.com
/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v
exploit, vendor-advisory
Sources
- CVE List CVE-2026-33955
- NVD CVE-2026-33955
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