EUVD-2026-35977
GHSA-8fh7-4j6j-cx8g
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from Vendor (qnap) · only source for this CVE.
CVSS VectorVendor: qnap
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
6DescriptionCVE.org
A command injection vulnerability has been reported to affect several QNAP operating system versions. If a remote attacker gains an administrator account, they can then exploit the vulnerability to execute arbitrary commands.
We have already fixed the vulnerability in the following versions: QTS 5.2.9.3492 build 20260507 and later QuTS hero h5.2.9.3499 build 20260514 and later
AnalysisAI
Authenticated command injection in QNAP QTS and QuTS hero NAS operating systems allows an attacker who already holds an administrator account to execute arbitrary OS commands on the appliance. The flaw carries a CVSS 4.0 score of 8.6, but the PR:H requirement substantially narrows the attacker population; no public exploit identified at time of analysis and the issue is not listed in CISA KEV. QNAP has shipped fixed builds (QTS 5.2.9.3492 build 20260507 and QuTS hero h5.2.9.3499 build 20260514).
Technical ContextAI
QTS and QuTS hero are QNAP's NAS operating systems built on a Linux base with a web-driven administrative UI that wraps numerous shell utilities. CWE-78 (Improper Neutralization of Special Elements used in an OS Command) indicates that one or more admin-accessible interfaces pass user-supplied input into a shell or system() style invocation without adequate sanitization or argument separation, allowing metacharacters to break out of the intended command. The CPE entries cpe:2.3:a:qnap_systems_inc.:qts and cpe:2.3:a:qnap_systems_inc.:quts_hero confirm both branches of the firmware family share the vulnerable code path, which is typical when QTS and QuTS hero are built from a common QTS codebase.
RemediationAI
Apply the vendor-released patches: upgrade QTS to 5.2.9.3492 build 20260507 or later, and QuTS hero to h5.2.9.3499 build 20260514 or later, as published in QNAP advisory QSA-26-23 (https://www.qnap.com/en/security-advisory/qsa-26-23). Until the firmware update is applied, reduce exposure by removing the NAS web administration interface from the public internet (block inbound access on the admin HTTP/HTTPS ports at the perimeter), enforce strong unique passwords plus 2FA on every administrator account, and audit existing admin accounts for unexpected entries - these controls do not close the bug but shrink the attacker population that can satisfy the PR:H prerequisite. Side effect: blocking remote admin access will break any remote management workflow (myQNAPcloud, mobile apps used administratively) until the patch is deployed.
QNAP QTS before 4.2.4 Build 20170313 allows attackers to execute arbitrary commands via unspecified vectors. Rated criti
QNAP QTS before 4.2.4 Build 20170313 allows attackers to gain administrator privileges and obtain sensitive information
QNAP has patched a remote code execution vulnerability affecting the QTS Media Library in all versions prior to QTS 4.2.
QNAP QTS before 4.2.4 Build 20170313 allows attackers to gain administrator privileges and execute arbitrary commands vi
QNAP QTS before 4.2.4 Build 20170313 allows local users to obtain sensitive Domain Administrator password information by
This command injection vulnerability in QTS allows attackers to run arbitrary commands in the compromised application. R
This improper input validation vulnerability allows remote attackers to inject arbitrary code to the system. Rated criti
A prototype pollution vulnerability has been reported to affect several QNAP operating system versions. Rated high sever
A buffer overflow vulnerability in external device function in QNAP QTS version 4.2.6 build 20171026, 4.3.3.0378 build 2
A buffer overflow vulnerability in password function in QNAP QTS version 4.2.6 build 20171026, 4.3.3.0378 build 20171117
A buffer overflow vulnerability in password function in QNAP QTS version 4.2.6 build 20171026, 4.3.3.0378 build 20171117
A buffer overflow vulnerability in password function in QNAP QTS version 4.2.6 build 20171026, 4.3.3.0378 build 20171117
Same weakness CWE-78 – OS Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
Leaving vuln.today