CVE-2026-39993: QNAP Systems Inc Download Station

High severity, CVSS 8.7. EPSS: 0.4% chance of exploitation in the next 30 days.

A relative path traversal vulnerability has been reported to affect Download Station. If a remote attacker gains a user account, they can then exploit the vulnerability to read the contents of unexpected files or system data. We have already fixed the vulnerability in the following version: Download Station 5.10.2.313 and later Download Station 5.11.3.322 and later

Affected products

• QNAP Systems Inc Download Station: from 5.10, before 5.10.2.313 (fixed in 5.10.2.313); from 5.11, before 5.11.3.322 (fixed in 5.11.3.322)

Published 2026-10-15. Last modified 2026-10-15.