How severe is CVE-2025-66278?

CVE-2025-66278 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2025-66278 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66278?

CVE-2025-66278 affects Qnap File Station. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66278?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-66278 have an EU (EUVD) identifier?

Yes. CVE-2025-66278 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206927.

When was CVE-2025-66278 published?

CVE-2025-66278 was published on 2026-02-11 and last updated on 2026-06-17.

CVE-2025-66278

CVE-2025-66278 is a medium-severity vulnerability in Qnap File Station with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 1.3
EPSS exploit prediction: 0% (33rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-206927
Weakness: CWE-22
Affected product: Qnap File Station
Published: 2026-02-11
Last modified: 2026-06-17

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

Frequently asked questions

What is CVE-2025-66278?: 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
How severe is CVE-2025-66278?: CVE-2025-66278 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2025-66278 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66278?: CVE-2025-66278 affects Qnap File Station. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66278?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66278 have an EU (EUVD) identifier?: Yes. CVE-2025-66278 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206927.
When was CVE-2025-66278 published?: CVE-2025-66278 was published on 2026-02-11 and last updated on 2026-06-17.

References

https://www.qnap.com/en/security-advisory/qsa-26-03

Affected products (1)

cpe:2.3:a:qnap:file_station:*:*:*:*:*:*:*:*

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