CVE-2026-73745: Fabric Composer Information Disclosure Flaw

CVE-2026-73745 Overview

CVE-2026-73745 is an information disclosure vulnerability in the API endpoint of HPE Networking Fabric Composer (Aruba Networks Fabric Composer). An unauthenticated remote attacker can view information handled by the affected system through the exposed API endpoint. The disclosed data can reveal insight into internal services and workflows. This exposure raises the risk of unauthorized access when the flaw is chained with other vulnerabilities. The issue is tracked under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor.

Critical Impact
Unauthenticated remote disclosure of internal service and workflow information that can support follow-on attacks against the fabric management plane.

Affected Products

HPE Networking Fabric Composer (Aruba Networks Fabric Composer)
API endpoints exposed by the Fabric Composer management interface
Deployments accessible from untrusted network segments

Discovery Timeline

2026-09-01 - CVE-2026-73745 published to NVD
2026-09-02 - Last updated in NVD database

Technical Details for CVE-2026-73745

Vulnerability Analysis

The vulnerability resides in an API endpoint of HPE Networking Fabric Composer. The endpoint returns information without enforcing authentication on the requesting client. An attacker who reaches the endpoint over the network can retrieve data describing internal services and workflows. The disclosed information is limited in scope and does not include integrity or availability impact. However, the exposed context supports reconnaissance for further attack stages against the fabric management platform.

Root Cause

The root cause is insufficient access control on an API endpoint that handles internal system information. The endpoint responds to unauthenticated requests and returns data that should be restricted to authorized operators. This matches the CWE-200 pattern of exposing sensitive information to an unauthorized actor. Successful exploitation also requires user interaction and specific conditions, which increases attack complexity.

Attack Vector

The attack is executed over the network against the Fabric Composer API. No credentials are required, but user interaction is needed and exploitation conditions are non-trivial. An attacker issues crafted HTTP requests to the vulnerable endpoint and parses the returned payload. Extracted metadata about internal services and workflows can then be used to identify additional weaknesses in the management plane. See the HPE Security Bulletin for vendor-provided technical details. No public proof-of-concept or exploit code is currently available.

// No verified exploit code is available for CVE-2026-73745.
// Refer to the HPE Security Bulletin for authoritative technical details.

Detection Methods for CVE-2026-73745

Indicators of Compromise

Unauthenticated HTTP or HTTPS requests to Fabric Composer API paths originating from untrusted networks.
Repeated API responses returning internal service or workflow metadata to clients without valid session tokens.
Anomalous user-agent strings or scripted access patterns hitting management-plane endpoints.

Detection Strategies

Inspect Fabric Composer access logs for API calls that succeed without an authenticated session identifier.
Baseline normal API consumers and alert on new source addresses issuing enumeration-style requests.
Correlate reconnaissance against the management API with subsequent authentication attempts or configuration changes.

Monitoring Recommendations

Forward Fabric Composer web and API logs to a centralized SIEM for retention and correlation.
Monitor management-plane network segments for east-west or north-south traffic from unexpected hosts.
Track outbound data volume from Fabric Composer nodes to identify bulk information retrieval.

How to Mitigate CVE-2026-73745

Immediate Actions Required

Apply the fixed version referenced in the HPE Security Bulletin as soon as it is available in your change window.
Restrict network access to the Fabric Composer management API to trusted administrative networks only.
Audit recent API access logs for unauthenticated requests that returned data.

Patch Information

HPE has published guidance for this vulnerability in security bulletin hpesbnw05133en_us. Administrators should consult the HPE Security Bulletin for the fixed release versions and upgrade procedures applicable to their deployment.

Workarounds

Place Fabric Composer behind a firewall or jump host that enforces authentication before requests reach the API.
Apply access control lists that permit management API access only from designated administrator subnets.
Terminate TLS at a reverse proxy that requires client certificates or additional authentication for API paths.

bash

# Example: restrict Fabric Composer management API access with iptables
iptables -A INPUT -p tcp --dport 443 -s 10.10.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP