---
id: CVE-2026-16876
title: >-
  An authentication bypass vulnerability exists in the WebGUI of Series UNIVERGE
  IX-R/IX-V
summary: >-
  An authentication bypass vulnerability exists in the WebGUI of Series UNIVERGE
  IX-R/IX-V. A user could bypass authentication and execute arbitrary CLI
  commands by tampering with WebGUI messages and sending them to the device via
  internet.
severity: critical
cvss: 9.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N'
cwe:
  - CWE-306
vendor: NEC Corporation
product: UNIVERGE IX-R/IX-V
affected:
  - >-
    univerge_ix-r_ix-v All versions from Ver1.1 through Ver1.3, All versions
    from Ver1.4.21 through Ver1.4.28 and Ver1.5.23
published: '2026-09-07'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T16:04:24.933'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-16876'
references:
  - url: 'https://jpn.nec.com/security-info/secinfo/nv26-005_en.html'
    label: psirt-info@cyber.jp.nec.com
tags:
  - nvd
  - cve.org
epss: 0.00331
epssPercentile: 0.26537
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-09-08T15:32:24.111712Z'
cvssSource: cna
ingestedAt: '2026-09-07T12:10:15.005Z'
---

## Overview

An authentication bypass vulnerability exists in the WebGUI of Series UNIVERGE IX-R/IX-V. A user could bypass authentication and execute arbitrary CLI commands by tampering with WebGUI messages and sending them to the device via internet.

## Remediation

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