What is CVE-2026-33955?

CVE-2026-33955 is a high-severity vulnerability in Streetwriters Notesnook Web/desktop, classified under Cross-site Scripting. CVSS score: 8.6/10. Published 2026-03-27.

How severe is CVE-2026-33955?

High severity. CVSS v3 base score is 8.6 out of 10.

RCE in Streetwriters Notesnook Web/desktop

CVE-2026-33955

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 triggere…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (8.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: 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 — versions < 3.3.11

Weakness classification (CWE)

References

https://github.com/streetwriters/notesnook/security/advisories/GHSA-45g3-cv93-q59v (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-33955?: CVE-2026-33955 is a high-severity vulnerability in Streetwriters Notesnook Web/desktop, classified under Cross-site Scripting. CVSS score: 8.6/10. Published 2026-03-27.
How severe is CVE-2026-33955?: High severity. CVSS v3 base score is 8.6 out of 10.