CVE-2026-94586 in Fabric OS
Summary
by MITRE • 10/08/2026
A command injection vulnerability exists in the WebTools administrative interface handling configuration download or file transfer operations of Brocade Fabric OS versions before 9.2.2d and 10.0.0 through 10.0.0a1. An authenticated user with permissions to perform configuration downloads using remote server profiles can supply malicious parameter strings to execute arbitrary shell commands on the switch with root privileges
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Analysis
by VulDB Data Team • 10/08/2026
The vulnerability identified in Brocade Fabric OS versions prior to 9.2.2d and within the range of 10.0.0 through 10.0.0a1 represents a critical security flaw located within the WebTools administrative interface, specifically affecting operations related to configuration downloads and file transfers. This component allows administrators to retrieve system configurations or transfer files using remote server profiles that define connection parameters such as hostnames, credentials, and protocols. The core technical deficiency lies in how these parameter strings are processed by the underlying operating system commands invoked during the download process. Instead of strictly validating or sanitizing user-supplied input before passing it to shell interpreters, the application fails to adequately escape special characters that hold significance in command-line environments. This lack of proper input validation allows an attacker who has obtained valid authentication credentials and possesses the necessary permissions for configuration downloads to inject arbitrary commands into the execution context.
From a technical perspective, this flaw is classified as CWE-78 Improper Neutralization of Special Elements used in an OS Command, commonly known as command injection. The vulnerability arises because the application constructs system-level shell commands by concatenating user-controlled input directly with static strings without employing safe APIs or rigorous escaping mechanisms. When an authenticated user submits a maliciously crafted parameter string containing shell metacharacters such as semicolons, pipes, or backticks, these characters are interpreted not as literal data but as command delimiters and operators by the underlying Unix-like operating system running on the switch hardware. Consequently, the injected commands execute with root privileges, which is the highest level of access available in most Linux-based embedded systems used in network infrastructure devices. This privilege escalation means that once a single arbitrary command is executed successfully, an attacker can chain additional commands to perform reconnaissance, modify system files, install persistent backdoors, or pivot into other parts of the data center fabric.
The operational impact of this vulnerability is severe due to the elevated privileges granted to the executing process and the critical nature of Brocade switches in enterprise storage area networks. An adversary with access to the WebTools interface can achieve full control over the affected switch, effectively compromising its integrity and availability. Beyond direct exploitation on the targeted device, successful exploitation facilitates lateral movement within the network fabric. Since these devices often manage critical data paths between servers and storage arrays, an attacker could potentially intercept traffic, modify routing tables, or disrupt services by manipulating configuration files that are subsequently downloaded or synchronized across the domain. This aligns with MITRE ATT&CK techniques such as T1059 Command and Scripting Interpreter for initial execution and T1222 File and Directory Permissions Modification if the attacker seeks to alter access controls for persistence.
Mitigation strategies must prioritize immediate patching of all affected Brocade Fabric OS instances to versions 9.2.2d or later, as well as any version beyond 10.0.0a1 where this issue has been resolved by vendors through code hardening and input sanitization improvements. In environments where upgrading is not immediately feasible, network segmentation should be enforced to restrict access to the WebTools administrative interface exclusively from trusted management stations using strong multi-factor authentication mechanisms. Additionally, implementing strict firewall rules that limit inbound connections to port 443 or other administrative ports only from known IP addresses can reduce the attack surface significantly. Security monitoring tools should also be configured to detect anomalous outbound traffic patterns or unexpected shell activity originating from network infrastructure devices, providing an additional layer of defense in depth against exploitation attempts targeting this specific command injection vector.