Medium 6.1Published Apr 1, 2026

CVE-2026-33978Notesnook is a note-taking app focused on user privacy & ease of use.

Updated under an hour ago (2026-10-19 06:25 UTC)

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It affects streetwriters notesnook_mobile. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for streetwriters notesnook_mobile

Exploited in the last 30 days

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 </a><img src=x onerror=...>. 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.

CVSS: 6.1 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

streetwriters notesnook_mobile streetwriters:notesnook_mobile	before 3.3.17; before 3.3.17	NVD

References

https://github.com/streetwriters/notesnook/commit/fc8807f74db5539036c5e58d3d68a11ea54098dbpatch
https://github.com/streetwriters/notesnook/releases/tag/3.3.17-androidrelease-notes
https://github.com/streetwriters/notesnook/security/advisories/GHSA-f27j-fqc6-v7pmexploit, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.