Hewlett Packard Enterprise (HPE) has rolled out crucial security patches for its Networking Fabric Composer after identifying several severe vulnerabilities. These vulnerabilities could enable unauthorized attackers to gain administrator-level access, execute arbitrary commands, and fully compromise affected systems.
Impact on HPE Fabric Composer
These security flaws are present in HPE Networking Fabric Composer version 7.3.3 and earlier. Fabric Composer plays a vital role in managing and automating data-center network fabrics. A successful exploitation of these vulnerabilities poses a significant threat as the platform oversees essential network infrastructure.
The most critical of these vulnerabilities have been assigned the identifiers CVE-2026-76657 and CVE-2026-76658, each receiving the highest possible CVSS score of 10.0. Such ratings underscore the potential risk associated with these flaws.
Details of the Vulnerabilities
The CVE-2026-76657 flaw pertains to an API authentication bypass. This vulnerability could allow a remote attacker to bypass existing authentication protocols, gaining unauthorized administrative privileges without valid credentials. Such access could potentially lead to a total takeover of the Fabric Composer host.
Another vulnerability, CVE-2026-76658, impacts the product’s SSH daemon. An attacker without authentication could exploit this to acquire administrative access and run arbitrary commands as a high-privilege user on the underlying operating system.
Additional Security Concerns and Recommendations
Furthermore, HPE addressed CVE-2026-19766, an adjacent-network authentication bypass with a severity score of 9.6. This vulnerability could enable an attacker on a connected network segment to execute arbitrary code with elevated operating-system permissions.
Additional issues include unauthenticated remote code execution bugs, stored cross-site scripting vulnerabilities, command injection, arbitrary file write, SQL injection, privilege escalation, information disclosure, and denial-of-service flaws. The potential for chaining these vulnerabilities to gain unauthorized control magnifies the risk.
HPE’s internal security team discovered these vulnerabilities, and the company has not observed any public exploit code or discussions targeting these issues as of their advisory release. However, the significant scope and severity of these vulnerabilities necessitate immediate patching, especially for systems exposed to untrusted networks.
Organizations using Fabric Composer should upgrade to version 7.4.0 or later in the 7.4 branch, or version 7.3.4 or later in the 7.3 branch. HPE recommends isolating command-line and web-based management interfaces to dedicated network segments, enforcing firewall controls, and utilizing logging to monitor access and activity.
Administrators are advised to identify all Fabric Composer installations, verify their versions, implement the vendor’s patches, and scrutinize administrator accounts, SSH usage, API access, and network management logs for unusual activity.
