CVE-2025-66277

QTS, QuTS hero

State: Published
Severity: 9.2 Critical
Published: Feb 11, 2026
Updated: Feb 26, 2026
Reserved: Nov 26, 2025

Description

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

Scores

CVSS	Score	Vector	Source
4.0	9.2 Critical	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	qnap

Weaknesses

CWE-59

Affected Products

Product	Versions
QTSQNAP Systems Inc.	5.2.x to before 5.2.8.3350 build 20251216Affected
QuTS heroQNAP Systems Inc.	h5.3.x to before h5.3.2.3354 build 20251225Affected h5.2.x to before h5.2.8.3350 build 20251216Affected

References

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

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.