CVE-2026-78414 Cross-site scripting in Nx Witness VMS Web Administration allows session token exfiltration via a rogue peer site name
An adjacent attacker can steal administrator session tokens via XSS in the Web Administration interface, leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-78414?
CVE-2026-78414 is a high-severity cross-site scripting vulnerability in Network Optix Nx Witness VMS, published on 24 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-78414?
How do I fix CVE-2026-78414?
No fix has been published for CVE-2026-78414 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-78414 being exploited?
There is no known exploitation of CVE-2026-78414 in the wild and no public exploit code.
Sources
Also known as GHSA-237w-25vx-r57c.