# CVE-2026-76657: HPE Networking Fabric Composer API authentication bypass

Source: https://junglewise.ai/threats/cve-2026-76657-hpe-networking-fabric-composer-api-authentication-bypass  
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-2026-76657 · Severity: critical · CVSS 10 · Published 2026-09-01

HPE Networking Fabric Composer is a network fabric management platform used to administer and control enterprise networking infrastructure. The product's API contains an authentication bypass vulnerability that allows unauthenticated remote attackers to gain administrative access, leading to complete compromise of the Fabric Composer system and potentially the entire managed network fabric.

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-2026-76657 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-76657 being exploited in the wild.

**How severe is CVE-2026-76657?** Critical severity, with a CVSS score of 10, published 1 September 2026.

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

**Is there a fix for CVE-2026-76657?** 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-2026-76657 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-76657?** 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

An authentication bypass vulnerability exists in the API of HPE Networking Fabric Composer, allowing unauthenticated remote attackers to circumvent authentication controls. The vulnerability is accessible over the network without requiring prior authentication or user interaction. Successful exploitation grants an attacker administrative privileges, enabling full compromise of the affected host and potentially the managed infrastructure it controls. This is a pre-authentication remote code execution pathway that presents critical risk to network environments relying on this management platform.

## 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)