CVE-2026-39993 PUBLISHED

Path Traversal to Root RCE in QNAP Download Station via Addon/Search addon Parameter

Assigner: qnap
Reserved: 08.04.2026 Published: 15.10.2026 Updated: 15.10.2026

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

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	QNAP Systems Inc.
Product	Download Station
Versions	Default: unaffected affected from 5.10.x to 5.10.2.313 (excl.) affected from 5.11.x to 5.11.3.322 (excl.)

Solutions

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

Credits

Joey Tang finder

References

https://www.qnap.com/en/app_releasenotes/list.php?app_choose=DownloadStation

Problem Types

CWE-23 CWE

Impacts

CAPEC-126