Is CVE-2026-33978 actively exploited?

No active exploitation of CVE-2026-33978 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-33978 be exploited remotely?

Yes. CVE-2026-33978 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-33978?

CVE-2026-33978 has a CVSS score of 5.4 (MEDIUM).

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MEDIUM

CVE-2026-33978

CWE-79Published: April 1, 2026· Updated: Apr 3, 2026

5.4

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.2th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-33978 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.