CVE-2026-33955 is a high-severity (CVSS 8.6) stored cross-site scripting (XSS) vulnerability affecting Notesnook desktop applications prior to version 3.3.11. This flaw allows an attacker to achieve remote code execution by injecting malicious code into note headers, which is triggered when viewed in the note history comparison viewer due to insecure HTML handling and Electron's configuration. Exploitation requires user interaction, but successful attacks can lead to a complete compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, nor are public exploit codes available, though the vulnerability has garnered some community discussion.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.3.11CPE matchmatch criteria | cpe:2.3:a:streetwriters:notesnook_desktop:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.