Cross-site scripting in Nx Witness VMS Web Administration allows session token exfiltration via a rogue peer site name

published 2026-08-24 2 mo ago modified 2026-10-12 28 d ago also EUVD-2026-64898

cvss: 8.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

Network Optix Nx Witness VMS 6.1.3

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 mo ago (2026-08-24)

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.0	CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Network Optix Nx Witness VMS

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

support.networkoptix.com /hc/en-us/articles/42950508518679-Security-Advisory-Cross-Site-Scripting-XSS-in-Merge-with-Another-Site-Dropdo
vendor-advisory

Sources

CVE List CVE-2026-78414
NVD CVE-2026-78414

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary