CVE-2025-66277 PUBLISHED

QTS, QuTS hero

Assigner: qnap
Reserved: 26.11.2025 Published: 11.02.2026 Updated: 11.02.2026

A link following vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to traverse the file system to unintended locations.

We have already fixed the vulnerability in the following versions: QTS 5.2.8.3350 build 20251216 and later QuTS hero h5.3.2.3354 build 20251225 and later QuTS hero h5.2.8.3350 build 20251216 and later

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 9.2

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	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	QNAP Systems Inc.
Product	QTS
Versions	Default: unaffected affected from 5.2.x to 5.2.8.3350 build 20251216 (excl.)

Vendor	QNAP Systems Inc.
Product	QuTS hero
Versions	Default: unaffected affected from h5.3.x to h5.3.2.3354 build 20251225 (excl.) affected from h5.2.x to h5.2.8.3350 build 20251216 (excl.)

Solutions

Credits

coral finder

References

https://www.qnap.com/en/security-advisory/qsa-26-05

Problem Types

CWE-59 CWE

Impacts

CAPEC-132