# CVE-2026-19766: HPE Networking Fabric Composer authentication bypass in OS

Source: https://junglewise.ai/threats/cve-2026-19766-hpe-networking-fabric-composer-authentication-bypass-in-os  
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-2026-19766 · Severity: critical · CVSS 9.6 · Published 2026-09-01

HPE Networking Fabric Composer is a network management platform that controls fabric switches and infrastructure. An authentication bypass vulnerability in its underlying operating system allows unauthenticated attackers on the same network segment to execute code with system privileges, potentially gaining complete control of the management host and all connected network equipment.

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-2026-19766 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-19766 being exploited in the wild.

**How severe is CVE-2026-19766?** Critical severity, with a CVSS score of 9.6, published 1 September 2026.

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

**Is there a fix for CVE-2026-19766?** 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-2026-19766 attacked?** It is attacked from the adjacent network, in a network appliance.

**Am I affected by CVE-2026-19766?** 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

This is an authentication bypass vulnerability in the underlying operating system of HPE Networking Fabric Composer. An unauthenticated adjacent attacker can exploit this flaw to achieve arbitrary code execution with privileged user rights on the OS layer. The attack vector is adjacent network access (same network segment), requiring no prior authentication. Successful exploitation results in complete compromise of the AFC host, including potential control over managed fabric infrastructure. Patches are expected to be available through HPE security advisories.

## Affected products

- HPE Networking Fabric Composer

## Timeline

- 2026-09-01: disclosed: CVE-2026-19766 published

## 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)