CVE-2026-41539
Received Received - Intake
Stored XSS in QNAP QTS and QuTS hero

Publication date: 2026-06-09

Last updated on: 2026-06-09

Assigner: QNAP Systems, Inc.

Description
A cross-site scripting (XSS) vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to bypass security mechanisms or read application data. We have already fixed the vulnerability in the following versions: QTS 5.2.9.3492 build 20260507 and later QuTS hero h5.2.9.3499 build 20260514 and later QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3500 build 20260520 and later
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Meta Information
Published
2026-06-09
Last Modified
2026-06-09
Generated
2026-06-09
AI Q&A
2026-06-09
EPSS Evaluated
N/A
NVD
CVE-2026-41539
EUVD
EUVD-2026-35350
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
qnap qts From 5.2.9.3492 (inc)
qnap quts_hero From h5.2.9.3499 (inc)
qnap quts_hero From h5.3.4.3500 (inc)
qnap quts_hero From h6.0.0.3500 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

This vulnerability is a cross-site scripting (XSS) issue affecting several versions of the QNAP operating system. It allows remote attackers to exploit the vulnerability to bypass security mechanisms or read application data.

Impact Analysis

The impact of this vulnerability includes the potential for attackers to bypass security controls and access sensitive application data remotely. This could lead to unauthorized data exposure or manipulation.

Mitigation Strategies

To mitigate this vulnerability, you should update your QNAP operating system to the fixed versions provided by the vendor.

  • For QTS, update to version 5.2.9.3492 build 20260507 or later.
  • For QuTS hero, update to version h5.2.9.3499 build 20260514 or later.
  • Alternatively, update to QuTS hero h5.3.4.3500 build 20260520 or later.
  • Or update to QuTS hero h6.0.0.3500 build 20260520 or later.
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