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CVE-2026-41539

HIGHCVSS 8.7/10EPSS 0.19%

Last modified

CVE-2026-41539 is a high-severity vulnerability rated 8.7/10 on the CVSS scale. 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. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1
6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS 4.0
8.7/10

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/E:X/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

EPSS Probability
0.19%

9.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
QnapQts5.2.0.2737Build 20240417
QnapQts5.2.0.2744Build 20240424
QnapQts5.2.0.2782Build 20240601
QnapQts5.2.0.2802Build 20240620
QnapQts5.2.0.2823Build 20240711
QnapQts5.2.0.2851Build 20240808
QnapQts5.2.0.2860Build 20240817
QnapQts5.2.1.2930Build 20241025
QnapQts5.2.2.2950Build 20241114
QnapQts5.2.3.3006Build 20250108
QnapQts5.2.4.3070Build 20250312
QnapQts5.2.4.3079Build 20250321
QnapQts5.2.4.3092Build 20250403
QnapQts5.2.5.3145Build 20250526
QnapQts5.2.6.3195Build 20250715
QnapQts5.2.6.3229Build 20250818
QnapQts5.2.7.3256Build 20250913
QnapQts5.2.7.3297Build 20251024
QnapQts5.2.8.3332Build 20251128
QnapQts5.2.8.3350Build 20251216
QnapQts5.2.8.3359Build 20251225
QnapQts5.2.9.3410Build 20260214
QnapQts5.2.9.3451Build 20260327
QnapQuts Heroh5.2.0.2737Build 20240417
QnapQuts Heroh5.2.0.2782Build 20240601
QnapQuts Heroh5.2.0.2789Build 20240607
QnapQuts Heroh5.2.0.2802Build 20240620
QnapQuts Heroh5.2.0.2823Build 20240711
QnapQuts Heroh5.2.0.2851Build 20240808
QnapQuts Heroh5.2.0.2860Build 20240817
QnapQuts Heroh5.2.1.2929Build 20241025
QnapQuts Heroh5.2.1.2940Build 20241105
QnapQuts Heroh5.2.2.2952Build 20241116
QnapQuts Heroh5.2.3.3006Build 20250108
QnapQuts Heroh5.2.4.3070Build 20250312
QnapQuts Heroh5.2.4.3079Build 20250321
QnapQuts Heroh5.2.5.3138Build 20250519
QnapQuts Heroh5.2.6.3195Build 20250715
QnapQuts Heroh5.2.7.3256Build 20250913
QnapQuts Heroh5.2.7.3297Build 20251024
QnapQuts Heroh5.2.8.3321Build 20251117
QnapQuts Heroh5.2.8.3350Build 20251216
QnapQuts Heroh5.2.8.3359Build 20251225
QnapQuts Heroh5.2.9.3410Build 20260214
QnapQuts Heroh5.2.9.3492Build 20260507
QnapQuts Heroh5.3.0.3115Build 20250430
QnapQuts Heroh5.3.0.3145Build 20250530
QnapQuts Heroh5.3.0.3192Build 20250716
QnapQuts Heroh5.3.1.3250Build 20250912
QnapQuts Heroh5.3.1.3292Build 20251024

Showing 50 of 56 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-41539?
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
How severe is CVE-2026-41539?
CVE-2026-41539 has a CVSS score of 8.7/10 (HIGH severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.
How do I fix CVE-2026-41539?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-41539?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST