# CVE-2026-16876: Auth bypass in UNIVERGE IX-R/IX-V

> Attackers can bypass authentication in the WebGUI to execute arbitrary CLI commands on NEC UNIVERGE IX-R/IX-V devices.

- **Severity:** Critical 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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 7 Sep 2026
- **Updated:** 8 Sep 2026
- **Also known as:** GHSA-8rh4-5q7c-x6qf

## What is CVE-2026-16876?

CVE-2026-16876 is a critical authentication bypass vulnerability in NEC Corporation UNIVERGE IX-R/IX-V, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-16876?


## How do I fix CVE-2026-16876?

No fix has been published for CVE-2026-16876 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-16876 being exploited?

There is no known exploitation of CVE-2026-16876 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-16876 and fix it if it is affected.

What it is: CVE-2026-16876 is a critical authentication bypass vulnerability in NEC Corporation UNIVERGE IX-R/IX-V, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-16876 in the wild and no public exploit code.

Affected product: NEC Corporation UNIVERGE IX-R/IX-V. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-16876/ (Markdown: https://insights.sbomify.com/CVE-2026-16876/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-16876
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-16876
- OSV: https://osv.dev/vulnerability/CVE-2026-16876

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-16876/
Summaries are generated and may contain mistakes; the official description above is the record.