CVE-2026-41539CWE-79

QTS, QuTS hero

Medium · published June 9, 2026

CVSS v4.0
6.3
EPSS
0%
Percentile
24.6
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
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
EPSS
0.00327 · 24.6th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-06-09T05:51Z
EPSS history
Timeline
  • 09 JUN 05:51Z
    QTS, QuTS hero
    cvelistv5