CVE-2026-39991

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

Published Oct 15, 2026 CVSS 4.0 · 4.8 Medium EPSS < 1% KEV · Not listed
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

Remediation

Vendor Solution

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

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Qnap Systems
Qnap Systems notes Station
Vendors & Products Qnap Systems
Qnap Systems notes Station
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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
Title Stored Cross-Site Scripting (XSS) in Note Station file upload functionality
Weaknesses CWE-79
References
Metrics cvssV4_0

{'score': 4.8, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
qnap
Published
Updated
Oct 29, 2026, 7:41 AM
Reserved
Apr 8, 2026, 2:30 AM
Status
Awaiting Analysis
Published
Oct 15, 2026, 10:17 AM
Modified
Oct 15, 2026, 4:32 PM