QNAP Download Station: Incorrect permission assignment allows privilege escalation
Summary
QNAP Download Station on QTS and QuTS hero NAS systems contains an incorrect permission assignment. The script ds-move-files.sh is writable and executed as root. A local attacker with an existing administrator account can exploit this to compromise the security of the system.
Affected
- QNAP Download Station 5.10.x before 5.10.1.312
- QNAP Download Station 5.11.x before 5.11.2.321
- Default configuration: not affected
Fixed in
- Download Station 5.10.1.312 and later
- Download Station 5.11.2.321 and later
- Newer builds also fix CVE-2026-39993 (5.10.2.313 and later, 5.11.3.322 and later)
Workaround
Unknown.
Exploitation
- No evidence of exploitation in the wild found.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- EPSS 0.00134. No public proof of concept found.
Our recommendation
- Inventory QNAP NAS units with Download Station and their versions.
- Update to the latest available 5.10.x or 5.11.x build, at minimum 5.10.1.312 or 5.11.2.321.
- Review administrator accounts, enable 2FA and check for unexpected admin logins.
- Restrict management access to LAN or VPN and remove unneeded internet exposure.
- Monitor QNAP advisories and NVD for a QSA ID and proof of concept.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- QNAP Download Station release notes www.qnap.com
- VulDB CVE-2026-34014 vuldb.com
- Vulners CVE-2026-34014 vulners.com
- OpenCVE CVE-2026-34014 app.opencve.io
- Strix CVE-2026-34014 www.strix.ai
- VulDB CVE-2026-39993 (related) vuldb.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 12:23.
Original description (NVD)
An incorrect permission assignment for critical resource vulnerability has been reported to affect Download Station. If a local attacker gains an administrator account, they can then exploit the vulnerability to compromise the security of the system. We have already fixed the vulnerability in the following version: Download Station 5.10.1.312 and later Download Station 5.11.2.321 and later
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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