CVE Catalog

CVE-2026-33978

MediumCVSS 5.4
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.29%

21th percentile - higher than 21% of all known CVEs

Summary

Notesnook prior to version 3.3.17 contains a stored XSS vulnerability in the mobile share / web clip flow because attacker-controlled clip metadata is concatenated into HTML without escaping and rendered via innerHTML in the editor WebView. Opening the share flow and selecting Web clip executes the malicious payload.

Risk Assessment

An attacker can execute arbitrary JavaScript in the victim's app context, potentially stealing note data or performing actions on the user's behalf.

Recommendation

Update the Notesnook app to version 3.3.17 or later on all mobile platforms.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS