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CVE

CVE-2026-33955

Notesnook vulnerable to RCE via stored XSS in Note History diff viewer
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CVE

CVE-2026-33955

Notesnook vulnerable to RCE via stored XSS in Note History diff viewer

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.6
-
3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33955.json, https://github.com/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v, https://nvd.nist.gov/vuln/detail/CVE-2026-33955

Severity

8.6

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
8.6
EPSS Probability
0.00027%
EPSS Percentile
0.08159%
Introduced Version
0
Fix Available
00a20dda48e63d04fec7724b8707c3a6b913f673

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