CVE-2026-41539

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

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-06-09 06:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-07-23 08:10 UTC Last updatedMost recent change to the record

Details

Published

2026-06-09 06:16 UTC

Last modified

2026-07-23 08:10 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-79 · Cross-site scripting

Record status

Modified

Affected

• Qnap Qts 5.2.0.2737
• Qnap Qts 5.2.0.2744
• Qnap Qts 5.2.0.2782
• Qnap Qts 5.2.0.2802
• Qnap Qts 5.2.0.2823
• Qnap Qts 5.2.0.2851
• Qnap Qts 5.2.0.2860
• Qnap Qts 5.2.1.2930

Attack profile CVSS 4.0 · 6.3

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

None

User interaction

Passive

Confidentiality

High

Integrity

High

Availability

High