Vulnerability · Published Jun 9, 2026 · Assigned by qnap
CVE-2026-41539QTS, QuTS hero
Medium 6.3
In plain English
A medium-severity cross-site scripting in QTS from QNAP Systems Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).
Official 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
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| QNAP Systems Inc. | QTS | 5.2.0 – before 5.2.9.3492 build 20260507 |
| QNAP Systems Inc. | QuTS hero | h5.2.0 – before h5.2.9.3499 build 20260514h5.3.0 – before h5.3.4.3500 build 20260520? – before h6.0.0.3500 build 20260520 |
Weakness: CWE-79 · 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/E:U