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Vulnerability · Published Oct 15, 2026 · Assigned by qnap

CVE-2026-39993Path Traversal to Root RCE in QNAP Download Station via Addon/Search addon Parameter

High 8.7

In plain English

A high-severity security flaw in Download Station from QNAP Systems Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).

Severity (CVSS 4.0)8.7High
Exploit odds (30 days)0.4%top 69.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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

Affected products (as reported)

VendorProductVersions
QNAP Systems Inc. Download Station 5.10.x – before 5.10.2.3135.11.x – before 5.11.3.322

Weakness: CWE-23 · 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

References