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

medium 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.

Plugin Details

Severity: Medium

ID: 505909

File Name: tenable_ot_qnap_CVE-2026-41539.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 7/31/2026

Updated: 7/31/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9.47

CVSS v3

Risk Factor: Medium

Base Score: 6.1

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

Patch Publication Date: 6/9/2026

Vulnerability Publication Date: 6/9/2026

Reference Information

CVE: CVE-2026-41539

CWE: 79

Detections

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