What is CVE-2026-41539?

CVE-2026-41539 is a medium-severity vulnerability in Qnap Qts, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-09.

How severe is CVE-2026-41539?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Qnap Qts

CVE-2026-41539

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…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.002 (9.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Qnap Qts — versions 5.2.0.2737, 5.2.0.2744, 5.2.0.2782
Qnap Quts_hero — versions h5.2.0.2737, h5.2.0.2782, h5.2.0.2789
Qnap Systems Inc. Qts — versions 5.2.0
Qnap Systems Inc. Quts Hero — versions h5.2.0, h5.3.0, ?

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security@qnapsecurity.com.tw (Broken Link)
security@qnapsecurity.com.tw

Frequently asked questions

What is CVE-2026-41539?: CVE-2026-41539 is a medium-severity vulnerability in Qnap Qts, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-09.
How severe is CVE-2026-41539?: Medium severity. CVSS v3 base score is 6.1 out of 10.