# CVE-2026-73703: Cross-site scripting in Fabric Composer

> Unauthenticated attackers can inject malicious scripts into the HPE Fabric Composer web interface, allowing arbitrary code execution in victim browsers.

- **Severity:** High 8.8 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 1 Sep 2026
- **Updated:** 2 Sep 2026
- **Also known as:** GHSA-v8m8-3qg6-2wc8

## What is CVE-2026-73703?

CVE-2026-73703 is a high-severity cross-site scripting vulnerability in Arubanetworks Fabric Composer, published on 1 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

A vulnerability in the web-based management interface of HPE Networking Fabric Composer could allow an unauthenticated adjacent attacker to conduct a stored cross-site scripting (XSS) attack against a user of the interface. A successful exploit could allow an attacker to execute arbitrary script code in a victim's browser in the context of the affected interface.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-73703?

It affects 1 product.


Products: Arubanetworks Fabric Composer.

## How do I fix CVE-2026-73703?

No fix has been published for CVE-2026-73703 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73703 being exploited?

There is no known exploitation of CVE-2026-73703 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-2026-73703 and fix it if it is affected.

What it is: CVE-2026-73703 is a high-severity cross-site scripting vulnerability in Arubanetworks Fabric Composer, published on 1 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-73703 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-2026-73703/ (Markdown: https://insights.sbomify.com/CVE-2026-73703/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73703
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73703
- OSV: https://osv.dev/vulnerability/CVE-2026-73703

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73703/
Summaries are generated and may contain mistakes; the official description above is the record.