PT-2026-29568 · Streetwriters · Notesnook+1

Ngocnn97 · Published 2026-04-01 · Updated 2026-04-01 · CVE-2026-33978

Mitre

CVSS v3.1

5.4

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Notesnook is a note-taking app focused on user privacy & ease of use. Prior to version 3.3.17, a stored XSS vulnerability exists in the mobile share / web clip flow because attacker-controlled clip metadata is concatenated into HTML without escaping and then rendered with innerHTML inside the mobile share editor WebView. An attacker can control the shared title metadata (for example through Android/iOS share metadata such as TITLE / SUBJECT, or through link-preview title data) and inject HTML such as . When the victim opens the Notesnook share flow and selects Web clip, the payload is inserted into the generated HTML and executed in the mobile editor WebView. This issue has been patched in version 3.3.17.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-33978

Affected Products

Notesnook

Notesnook Mobile

References · 4

• https://github.com/streetwriters/notesnook/commit/fc8807f74db5539036c5e58d3d68a11ea54098db · Patch
• https://github.com/streetwriters/notesnook/security/advisories/GHSA-f27j-fqc6-v7pm · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33978 · Security Note
• https://github.com/streetwriters/notesnook/releases/tag/3.3.17-android · Note