# CVE-2026-16876

## Summary

- **CVE ID:** CVE-2026-16876
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (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
- **Published:** Sep 7, 2026
- **Last Modified:** Sep 8, 2026

## Description

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.

## Affected Products

- NEC Corporation — 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)

## References

- [CNA](https://jpn.nec.com/security-info/secinfo/nv26-005_en.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.33%
- **EPSS Percentile:** 25.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._