CVE-2026-78414
Stored XSS in Nx Witness VMS enabling admin session theft and takeover
Is CVE-2026-78414 being exploited?
Not confirmed. CVE-2026-78414 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-78414?
CVE-2026-78414 is rated High with a CVSS score of 8.0. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-78414?
Yes. A fix has been recorded for CVE-2026-78414. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-78414 affect?
CVE-2026-78414 affects Network Optix Nx Witness VMS < 6.1.3 (Linux, Windows, macOS). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-78414?
Upgrade to Nx Witness VMS 6.1.3+ and restrict untrusted Nx servers on the network
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Adjacent-network attacker can run JS in an admin's browser, steal session tokens and achieve Administrator account takeover.
Immediate action required
- affected< 6.1.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.