CVE-2026-76657: Authentication Bypass in HPE Networking Fabric Composer API allows Administrative Access

Severity: critical (CVSS 10.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-01 · updated 2026-09-02
Weakness: CWE-287

Description

Vulnerabilities have been identified in the API of HPE Networking Fabric Composer that could potentially allow an unauthenticated remote attacker to circumvent existing authentication controls. Successful exploitation could allow an attacker to gain administrative privileges leading to complete compromise of the HPE Networking Fabric Composer host.

Affected products

Hewlett Packard Enterprise (HPE) Fabric Composer: before 7.3.4 — fixed in 7.3.4

How to fix

Upgrade to a fixed version: Hewlett Packard Enterprise (HPE) Fabric Composer 7.3.4. Check the vendor advisory for mitigations.

References

https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbnw05133en_us&docLocale=en_US

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