# CVE-2026-73742: Improper Client Address Validation allows Request Attribution Spoofing in Fabric Composer API Endpoint

> An authenticated low-privilege user can spoof source addresses in HPE Fabric Composer, causing inaccurate request attribution records.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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:** 1 Sep 2026
- **Updated:** 1 Sep 2026
- **Also known as:** GHSA-365r-j26r-xggv

## What is CVE-2026-73742?

CVE-2026-73742 is a medium-severity vulnerability in Arubanetworks Fabric Composer, published on 1 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability in an API endpoint of HPE Networking Fabric Composer could allow an authenticated low privilege operator user to spoof the source address attributed to their requests. Successful exploitation could allow an attacker to cause inaccurate attribution information to be recorded on the affected system.

Weakness: CWE-290 (Authentication Bypass by Spoofing)

## Which versions are affected by CVE-2026-73742?

It affects 1 product.


Products: Arubanetworks Fabric Composer.

## How do I fix CVE-2026-73742?

No fix has been published for CVE-2026-73742 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73742 being exploited?

There is no known exploitation of CVE-2026-73742 in the wild and no public exploit code.

## Other vulnerabilities in Arubanetworks Fabric Composer

- [CVE-2026-76657](https://insights.sbomify.com/CVE-2026-76657/): Authentication Bypass in HPE Networking Fabric Composer API allows Administrative Access (critical 10.0)
- [CVE-2026-76658](https://insights.sbomify.com/CVE-2026-76658/): Unauthenticated Remote Code Execution in HPE Networking Fabric Composer SSH Daemon (critical 10.0)
- [CVE-2026-19766](https://insights.sbomify.com/CVE-2026-19766/): Authentication Bypass leads to Administrative control of adjacent network hosts in HPE Networking Fabric Composer (critical 9.6)
- [CVE-2026-73700](https://insights.sbomify.com/CVE-2026-73700/): Cross-site scripting in Fabric Composer (critical 9.0)
- [CVE-2026-73701](https://insights.sbomify.com/CVE-2026-73701/): Unauthenticated Remote Code Execution in HPE Networking Fabric Composer (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73742 and fix it if it is affected.

What it is: CVE-2026-73742 is a medium-severity vulnerability in Arubanetworks Fabric Composer, published on 1 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-2026-73742 in the wild and no public exploit code.

Affected product: Arubanetworks Fabric Composer. 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-2026-73742/ (Markdown: https://insights.sbomify.com/CVE-2026-73742/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73742
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73742
- OSV: https://osv.dev/vulnerability/CVE-2026-73742

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73742/
Summaries are generated and may contain mistakes; the official description above is the record.