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Qnap QTS and QuTS hero Cross-site Scripting (CVE-2026-41539)

high Tenable OT Security Plugin ID 505909

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A cross-site scripting (XSS) vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to bypass security mechanisms or read application data. 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 QuTS hero h5.3.4.3500 build 20260520 and later QuTS hero h6.0.0.3500 build 20260520 and later

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Refer to the vendor advisory.

See Also

https://www.qnap.com/en/security-advisory/qsa-26-10

Plugin Details

Severity: High

ID: 505909

File Name: tenable_ot_qnap_CVE-2026-41539.nasl

Version: 1.2

Type: Remote

Family: Tenable.ot

Published: 7/31/2026

Updated: 8/3/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9.47

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2026-41539

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.3

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: cpe:/o:qnap:qts:5.2.0.2737:build_20240417, cpe:/o:qnap:qts:5.2.0.2744:build_20240424, cpe:/o:qnap:qts:5.2.0.2782:build_20240601, cpe:/o:qnap:qts:5.2.0.2802:build_20240620, cpe:/o:qnap:qts:5.2.0.2823:build_20240711, cpe:/o:qnap:qts:5.2.0.2851:build_20240808, cpe:/o:qnap:qts:5.2.0.2860:build_20240817, cpe:/o:qnap:qts:5.2.1.2930:build_20241025, cpe:/o:qnap:qts:5.2.2.2950:build_20241114, cpe:/o:qnap:qts:5.2.3.3006:build_20250108, cpe:/o:qnap:qts:5.2.4.3070:build_20250312, cpe:/o:qnap:qts:5.2.4.3079:build_20250321, cpe:/o:qnap:qts:5.2.4.3092:build_20250403, cpe:/o:qnap:qts:5.2.5.3145:build_20250526, cpe:/o:qnap:qts:5.2.6.3195:build_20250715, cpe:/o:qnap:qts:5.2.6.3229:build_20250818, cpe:/o:qnap:qts:5.2.7.3256:build_20250913, cpe:/o:qnap:qts:5.2.7.3297:build_20251024, cpe:/o:qnap:qts:5.2.8.3332:build_20251128, cpe:/o:qnap:qts:5.2.8.3350:build_20251216, cpe:/o:qnap:qts:5.2.8.3359:build_20251225, cpe:/o:qnap:qts:5.2.9.3410:build_20260214, cpe:/o:qnap:qts:5.2.9.3451:build_20260327, cpe:/o:qnap:quts_hero:h5.2.0.2737:build_20240417, cpe:/o:qnap:quts_hero:h5.2.0.2782:build_20240601, cpe:/o:qnap:quts_hero:h5.2.0.2789:build_20240607, cpe:/o:qnap:quts_hero:h5.2.0.2802:build_20240620, cpe:/o:qnap:quts_hero:h5.2.0.2823:build_20240711, cpe:/o:qnap:quts_hero:h5.2.0.2851:build_20240808, cpe:/o:qnap:quts_hero:h5.2.0.2860:build_20240817, cpe:/o:qnap:quts_hero:h5.2.1.2929:build_20241025, cpe:/o:qnap:quts_hero:h5.2.1.2940:build_20241105, cpe:/o:qnap:quts_hero:h5.2.2.2952:build_20241116, cpe:/o:qnap:quts_hero:h5.2.3.3006:build_20250108, cpe:/o:qnap:quts_hero:h5.2.4.3070:build_20250312, cpe:/o:qnap:quts_hero:h5.2.4.3079:build_20250321, cpe:/o:qnap:quts_hero:h5.2.5.3138:build_20250519, cpe:/o:qnap:quts_hero:h5.2.6.3195:build_20250715, cpe:/o:qnap:quts_hero:h5.2.7.3256:build_20250913, cpe:/o:qnap:quts_hero:h5.2.7.3297:build_20251024, cpe:/o:qnap:quts_hero:h5.2.8.3321:build_20251117, cpe:/o:qnap:quts_hero:h5.2.8.3350:build_20251216, cpe:/o:qnap:quts_hero:h5.2.8.3359:build_20251225, cpe:/o:qnap:quts_hero:h5.2.9.3410:build_20260214, cpe:/o:qnap:quts_hero:h5.2.9.3492:build_20260507, cpe:/o:qnap:quts_hero:h5.3.0.3115:build_20250430, cpe:/o:qnap:quts_hero:h5.3.0.3145:build_20250530, cpe:/o:qnap:quts_hero:h5.3.0.3192:build_20250716, cpe:/o:qnap:quts_hero:h5.3.1.3250:build_20250912, cpe:/o:qnap:quts_hero:h5.3.1.3292:build_20251024, cpe:/o:qnap:quts_hero:h5.3.2.3354:build_20251225, cpe:/o:qnap:quts_hero:h5.3.3.3424:build_20260305, cpe:/o:qnap:quts_hero:h6.0.0.3324:build_20251125, cpe:/o:qnap:quts_hero:h6.0.0.3382:build_20260122, cpe:/o:qnap:quts_hero:h6.0.0.3397:build_20260206, cpe:/o:qnap:quts_hero:h6.0.0.3459:build_20260409

Required KB Items: Tenable.ot/Qnap

Exploit Ease: No known exploits are available

Patch Publication Date: 6/9/2026

Vulnerability Publication Date: 6/9/2026

Reference Information

CVE: CVE-2026-41539

CWE: 79