Medium severity · published Feb 11, 2026
CVE-2025-66278
File Station 5
6.5
CVSS
0.5%
EPSS
No
On KEV
Description
A path traversal vulnerability has been reported to affect File Station 5. 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:
File Station 5 5.5.6.5190 and later
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FS
File Station 5 · QNAP Systems Inc.
5.5.x before 5.5.6.5190 · source: vendor
FS
File Station · Qnap
5.5.6.4691 before 5.5.6.5190 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66278
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66278
Vendor Advisory
https://www.qnap.com/en/security-advisory/qsa-26-03
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