CVE-2026-39991

Stored Cross-Site Scripting (XSS) in Note Station file upload functionality

State: Published
Severity: 4.8 Medium
Published: Oct 15, 2026
Updated: Oct 29, 2026
Reserved: Apr 8, 2026

Description

A cross-site scripting (XSS) vulnerability has been reported to affect Notes Station 3. If a remote attacker gains a user account, they can then exploit the vulnerability to inject malicious code.

We have already fixed the vulnerability in the following version: Notes Station 3 3.9.12 and later

Scores

CVSS	Score	Vector	Source
4.0	4.8 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N	qnap

Weaknesses

CWE-79

Affected Products

Product	Versions
Notes Station 3QNAP Systems Inc.	3.9.x to before 3.9.12Affected

References

https://www.qnap.com/en/app-release-notes?keyword=Notes%20Station%203&app=NotesStation3&product-line=nasrelease-notes

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