# CVE-2026-73703: HPE Networking Fabric Composer stored XSS in web management interface

Source: https://junglewise.ai/threats/cve-2026-73703-hpe-networking-fabric-composer-stored-xss-in-web-management  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-01. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-73703 · Severity: high · CVSS 8.8 · Published 2026-09-01

HPE Networking Fabric Composer is a web-based management tool for enterprise network fabric devices. A stored cross-site scripting (XSS) vulnerability in its management interface allows an attacker on the adjacent network to inject malicious code that executes when legitimate administrators access the interface, potentially compromising their accounts or stealing sensitive network configuration data.

Technologies: [Arubanetworks Fabric Composer](https://junglewise.ai/threats/technologies/fabric-composer), [Hpe Networking Fabric Composer](https://junglewise.ai/threats/technologies/networking-fabric-composer). Vendors: [Arubanetworks](https://junglewise.ai/threats/vendors/arubanetworks), [Hpe](https://junglewise.ai/threats/vendors/hpe).

## Quick answers

**Is CVE-2026-73703 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-73703 being exploited in the wild.

**How severe is CVE-2026-73703?** High severity, with a CVSS score of 8.8, published 1 September 2026.

**Which products and versions are affected?** HPE Networking Fabric Composer.

**Is there a fix for CVE-2026-73703?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-73703 attacked?** It is attacked from the adjacent network or over the network.

**Am I affected by CVE-2026-73703?** Check whether you run Arubanetworks Fabric Composer or Hpe Networking Fabric Composer. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a stored cross-site scripting (XSS) flaw in the web-based management interface of HPE Networking Fabric Composer. An unauthenticated adjacent attacker can inject malicious script code that persists in the application, which then executes in the browser context of authenticated users accessing the interface. The attack requires network adjacency but no prior authentication, and successful exploitation allows arbitrary JavaScript execution in victims' browsers within the interface security context. This could lead to session hijacking, credential theft, or unauthorized network configuration changes.

## Affected products

- HPE Networking Fabric Composer

## Timeline

- 2026-09-01: disclosed

## References

- [https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05133en_us&docLocale=en_US](https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05133en_us&docLocale=en_US)

## Related threats

- [HPE Networking Fabric Composer API race condition](https://junglewise.ai/threats/cve-2026-95772-a-race-condition-vulnerability-exists-in-the-api-of-hpe)
- [HPE Networking Fabric Composer information disclosure in API](https://junglewise.ai/threats/cve-2026-95771-an-authenticated-information-disclosure-vulnerability-exists-in)
- [HPE Networking Fabric Composer information disclosure in OS](https://junglewise.ai/threats/cve-2026-95770-a-sensitive-information-disclosure-vulnerability-in-the)
- [HPE Networking Fabric Composer audit log spoofing](https://junglewise.ai/threats/cve-2026-95769-an-audit-log-spoofing-vulnerability-exists-in-the-api-of-hpe)
- [HPE Networking Fabric Composer API privilege escalation](https://junglewise.ai/threats/cve-2026-95768-a-privilege-escalation-vulnerability-exists-in-the-api-of-hpe)