RCE in Streetwriters Notesnook
CVE-2026-42090
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 r…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (38.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.
Affected products
- Streetwriters Notesnook — versions Notesnook Web/Desktop < 3.3.15, Notesnook iOS/Android < 3.3.20
- Streetwriters Notesnook_desktop
- Streetwriters Notesnook_mobile
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42090?
- CVE-2026-42090 is a critical-severity vulnerability in Streetwriters Notesnook, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2026-05-04.
- How severe is CVE-2026-42090?
- Critical severity. CVSS v3 base score is 9.6 out of 10.