CVE-2026-41539 PUBLISHED

QTS, QuTS hero

Assigner: qnap
Reserved: 21.04.2026 Published: 09.06.2026 Updated: 09.06.2026

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

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	QNAP Systems Inc.
Product	QTS
Versions	Default: unaffected affected from 5.2.0 to 5.2.9.3492 build 20260507 (excl.)

Vendor	QNAP Systems Inc.
Product	QuTS hero
Versions	Default: unaffected affected from h5.2.0 to h5.2.9.3499 build 20260514 (excl.) affected from h5.3.0 to h5.3.4.3500 build 20260520 (excl.) affected from ? to h6.0.0.3500 build 20260520 (excl.)

Solutions

References

https://www.qnap.com/en/security-advisory/qsa-26-31

Problem Types

CWE-79 CWE

Impacts

CAPEC-63