---
id: CVE-2026-39991
title: >-
  A cross-site scripting (XSS) vulnerability has been reported to affect Notes
  Station 3
summary: >-
  A cross-site scripting (XSS) vulnerability has been reported to affect Notes
  Station 3. If a remote attacker gains a user account, they can then exploit
  the vulnerability to inject malicious code.


  We have already fixed the vulnerability…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'
cwe:
  - CWE-79
vendor: QNAP Systems Inc.
product: Notes Station 3
affected:
  - notes_station_3 >= 3.9.x < 3.9.12
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T10:17:14.073'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-39991'
references:
  - url: >-
      https://www.qnap.com/en/app-release-notes?keyword=Notes%20Station%203&app=NotesStation3&product-line=nas
    label: security@qnapsecurity.com.tw
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-15T09:59:33.286Z'
---

## Overview

A cross-site scripting (XSS) vulnerability has been reported to affect Notes Station 3. If a remote attacker gains a user account, they can then exploit the vulnerability to inject malicious code.

We have already fixed the vulnerability in the following version:
Notes Station 3 3.9.12 and later

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.