# CVE-2026-16892: IBM i is Affected By An Improper Authentication Vulnerability in Network Authentication Service []

> Remote authenticated attackers can bypass security restrictions in IBM i Network Authentication Service due to improper service-name matching.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Sep 2026
- **Updated:** 4 Sep 2026
- **Also known as:** GHSA-qf4g-ggmg-f869

## What is CVE-2026-16892?

CVE-2026-16892 is a medium-severity authentication bypass vulnerability in Ibm I, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote authenticated attacker to bypass security restrictions due to improper authentication during service-name matching.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2026-16892?

It affects 1 product.


Products: Ibm I.

## How do I fix CVE-2026-16892?

No fix has been published for CVE-2026-16892 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-16892 being exploited?

There is no known exploitation of CVE-2026-16892 in the wild and no public exploit code.

## Other vulnerabilities in Ibm I

- [CVE-2026-96119](https://insights.sbomify.com/CVE-2026-96119/): IBM i is Affected By An Improper Control of Code Generation Vulnerability in HTTP Server Administration GUI (critical 9.9)
- [CVE-2026-16860](https://insights.sbomify.com/CVE-2026-16860/): IBM i is Affected By Remote Code Execution Vulnerability [] (critical 9.9)
- [CVE-2026-17083](https://insights.sbomify.com/CVE-2026-17083/): IBM i is Affected By Multiple Vulnerabilities in the Debug Server (critical 9.8)
- [CVE-2026-17218](https://insights.sbomify.com/CVE-2026-17218/): IBM i is Affected By Remote Code Execution Vulnerability in Line Printer Daemon [] (critical 9.8)
- [CVE-2026-17276](https://insights.sbomify.com/CVE-2026-17276/): IBM i is Affected By Multiple Vulnerabilities in Navigator for i (critical 9.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-16892 and fix it if it is affected.

What it is: CVE-2026-16892 is a medium-severity authentication bypass vulnerability in Ibm I, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-16892 in the wild and no public exploit code.

Affected product: Ibm I. 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-2026-16892/ (Markdown: https://insights.sbomify.com/CVE-2026-16892/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-16892
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-16892
- OSV: https://osv.dev/vulnerability/CVE-2026-16892

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-16892/
Summaries are generated and may contain mistakes; the official description above is the record.