CVE-2026-39993
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Relative Path Traversal in QNAP Download Station

Publication date: 2026-10-15

Last updated on: 2026-10-15

Assigner: QNAP Systems, Inc.

Description
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

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Meta Information

Published
2026-10-15
Last Modified
2026-10-15
Generated
2026-10-19
AI Q&A
2026-10-15
EPSS Evaluated
2026-10-18
NVD
CVE-2026-39993
EUVD
EUVD-2026-101879

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
QNAP Systems Inc. Download Station 5.10.x
QNAP Systems Inc. Download Station 5.11.x

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-23 The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.

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Executive Summary

This vulnerability is a relative path traversal issue in QNAP's Download Station software. It allows an attacker with a user account to access files or system data they should not be able to read by manipulating file paths.

Detection Guidance

This vulnerability requires an attacker to have a user account on the system. Detection involves checking if Download Station is running an outdated version. Use commands like 'cat /etc/version' or 'dpkg -l | grep DownloadStation' to verify the installed version. If it is below 5.10.2.313 or 5.11.3.322, the system is vulnerable.

Impact Analysis

If exploited, this vulnerability could allow unauthorized access to sensitive files or system data on your QNAP device. Attackers might steal confidential information, modify files, or perform other malicious actions depending on their goals.

Compliance Impact

This vulnerability could lead to data breaches, which may violate compliance requirements such as GDPR or HIPAA. Unauthorized access to personal or health data could result in legal penalties, fines, or reputational damage for organizations.

Mitigation Strategies
  • Update Download Station to version 5.10.2.313 or later, or 5.11.3.322 or later, depending on your current version.
  • Ensure only trusted users have access to the system to prevent unauthorized exploitation.

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