---
id: CVE-2026-78414
title: >-
  Cross-site scripting in the Web Administration interface of Network Optix Nx
  Witness VMS before version 6.1.3 on Linux, Windows and MacOS allows an
  adjacent-network attacker to execute arbitrary JavaScript in the browser of an
  authentica…
summary: >-
  Cross-site scripting in the Web Administration interface of Network Optix Nx
  Witness VMS before version 6.1.3 on Linux, Windows and MacOS allows an
  adjacent-network attacker to execute arbitrary JavaScript in the browser of an
  authentica…
severity: high
cvss: 8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-79
published: '2026-08-24'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T15:10:00.207'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78414'
references:
  - url: >-
      https://support.networkoptix.com/hc/en-us/articles/42950508518679-Security-Advisory-Cross-Site-Scripting-XSS-in-Merge-with-Another-Site-Dropdown
    label: 96d4e157-0bf0-48b3-8efd-382c68caf4e0
tags:
  - nvd
epss: 0.00338
epssPercentile: 0.25272
ingestedAt: '2026-10-12T15:55:08.121Z'
---

## Overview

Cross-site scripting in the Web Administration interface of Network Optix Nx Witness VMS before version 6.1.3 on Linux, Windows and MacOS allows an adjacent-network attacker to execute arbitrary JavaScript in the browser of an authenticated administrator and steal the administrator's session token, resulting in Administrator Account Takeover. An attacker who controls an Nx server on the same network segment can set that server's site name to a script payload, which executes when an administrator opens the "Merge with Another Site" dialog and the site selection list is displayed.Solution:

Update to Nx Witness VMS version 6.1.3 or later.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.