CVE-2025-66277CWE-59

QTS, QuTS hero

Critical · published February 11, 2026

CVSS v4.0
9.2
EPSS
1%
Percentile
53.1
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v4.0
9.2 · CRITICAL
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
EPSS
0.00713 · 53.1th percentile
Weakness
CWE-59 · Improper Link Resolution Before File Access ('Link Following')
Published
2026-02-11T12:15Z
EPSS history
Timeline
  • 11 FEB 12:15Z
    QTS, QuTS hero
    cvelistv5