CVE-2026-39991

EUVD-2026-101986
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
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
qnapCNA
4.8 MEDIUM
NETWORK
LOW
LOW
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
Base Score
CVSS 3.x
EPSS Score
Percentile: 39.55%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
qnapnotes_station_3
3.9.0 ≤
𝑥
< 3.9.12
CNA
Common Weakness Enumeration
References
https://www.qnap.com/en/app-release-notes?keyword=Notes%20Station%203&app=NotesStation3&product-line=nas