HPE Fabric Composer Vulnerabilities Expose Critical Systems

TL;DR

Hewlett Packard Enterprise disclosed dozens of critical HPE Fabric Composer vulnerabilities. These flaws allow unauthenticated attackers to execute arbitrary code and bypass authentication. Administrators must urgently update their systems to version 7.4.0 or 7.3.4 to prevent complete host compromise.

Notable CVEs

Why It Matters

Organizations rely on Fabric Composer to orchestrate switches and manage network policies. Compromising this platform hands threat actors the keys to the kingdom. They can intercept traffic, deploy ransomware, or pivot into other sensitive network segments. The vendor rates several of these bugs with a maximum CVSS score of 10.0. This severity indicates that attackers can exploit them remotely without any user interaction. Because these systems manage corporate networks, an unmitigated flaw poses a massive operational risk. These critical HPE Fabric Composer vulnerabilities demand immediate attention from IT teams. Delaying patches leaves critical infrastructure exposed to total administrative takeover.

How the Attack Works

Attackers can exploit the API, web interface, and the SSH daemon in multiple ways. For CVE-2026-76657, a flaw in the API allows a remote threat actor to bypass authentication checks. The advisory states that a successful attack “could allow an attacker to gain administrative privileges leading to complete compromise.” Meanwhile, CVE-2026-76658 targets the SSH daemon directly. This specific bug permits unauthenticated remote command execution as a privileged user. An adjacent attacker can also exploit CVE-2026-19766 within the underlying operating system. They bypass authentication to execute arbitrary code on the adjacent network. The API lacks proper command sanitization, allowing authenticated lower-level operators to escalate privileges. Furthermore, the web interface contains stored cross-site scripting flaws. A low-privilege user can plant malicious scripts that execute when an admin views the page. Together, these mechanisms grant threat actors full system access.

Affected Versions

These flaws impact HPE Networking Fabric Composer versions 7.3.3 and below. Security experts presume that unsupported software versions are also vulnerable. Organizations running legacy versions must upgrade immediately to ensure proper security. Exact user and installation counts remain unknown at this time. Currently, HPE confirms no active exploitation in the wild. The vendor clarified this detail in their security report. They state they are “not aware of any public discussion or exploit code that targets the listed vulnerabilities.” However, security experts urge rapid patching due to the high severity scores.

Patch or Mitigation Steps

Network administrators must update to HPE Networking Fabric Composer 7.4.0 or 7.3.4 immediately. If patching is impossible right away, apply strict access controls. HPE recommends that administrators restrict the CLI and web-based management interfaces. Move these interfaces to a dedicated layer 2 segment or VLAN. Alternatively, protect them with firewall policies at layer 3 and above. Enable thorough accounting controls to log all user activities and resource usage.

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Written by

@DdoS · Security Researcher

Do Son

Do Son is the Founder and Editor of SecurityOnline.info. Working in cybersecurity since 2013, he reports on vulnerabilities, malware, and emerging threats, providing timely analysis to help organizations and individuals stay ahead of evolving risks.