CVE-2026-87666 in Fabric OS
Summary
by MITRE • 10/08/2026
An OS command injection vulnerability exists in the time and zone management subsystem of Brocade Fabric OS versions before 9.2.2d and 10.0.0 through 10.0.0a1. When updating system timezone settings via the REST API or configuration download routines, the system fails to sanitize input values before processing them in underlying shell execution routines. An authenticated user with low-privilege administrative access can exploit this vulnerability by submitting a crafted timezone string containing shell metacharacters. Successful exploitation allows the attacker to escape the restricted management environment and execute arbitrary shell commands with elevated privileges.
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Analysis
by VulDB Data Team • 10/08/2026
The identified flaw resides within the time and zone management subsystem of Brocade Fabric OS, specifically affecting versions prior to 9.2.2d as well as the initial releases in the 10.0.0 series up through version 10.0.0a1. This vulnerability is classified as an operating system command injection, which corresponds to CWE-78 in the Common Weakness Enumeration taxonomy. The core technical deficiency stems from a failure to properly sanitize user-supplied input before it is passed to underlying shell execution routines. When administrators or automated systems update timezone settings via the REST API interface or through configuration download mechanisms, the application processes these values without adequate validation against special characters that hold significance in command-line environments. This lack of input sanitization creates a direct pathway for malicious actors to inject arbitrary commands into the system context.
The operational impact of this vulnerability is severe due to the privilege level required and the resulting access gained upon exploitation. An attacker who possesses authenticated, low-privilege administrative access can leverage this flaw by submitting a crafted timezone string that includes shell metacharacters such as semicolons or pipe operators. By embedding these characters within the input field, the attacker tricks the system into interpreting part of the data not merely as configuration parameters but as executable commands. Successful exploitation allows the adversary to escape the restricted management environment and execute arbitrary shell commands with elevated privileges. This effectively bypasses the intended security boundaries of the low-privilege account, granting control over critical network infrastructure components that manage storage area networks.
From a threat intelligence perspective, this vulnerability aligns with ATT&CK technique T1059, which covers Command and Scripting Interpreter abuse, specifically within the context of local privilege escalation or lateral movement if combined with other exploits. The ability to execute commands as an elevated user significantly compromises the integrity and availability of the fabric infrastructure. Attackers could potentially modify routing tables, disrupt storage connectivity, or install persistent backdoors for long-term access. Given that Brocade Fabric OS is widely deployed in enterprise data centers, this vulnerability poses a substantial risk to organizations relying on these systems for critical business operations.
Mitigation strategies must prioritize immediate patching of the affected software versions. Administrators should upgrade to version 9.2.2d or later, ensuring they are running a release that includes the necessary input validation fixes in the time and zone management subsystem. In environments where immediate patching is not feasible due to operational constraints, temporary mitigations include restricting access to the REST API endpoints associated with timezone configuration to only those users who require it for essential functions. Additionally, implementing strict network segmentation can limit exposure by ensuring that low-privilege administrative accounts cannot reach vulnerable systems from untrusted networks. Continuous monitoring of system logs for unusual command execution patterns or unexpected changes in time settings should also be enforced to detect potential exploitation attempts early.