CVE-2026-87666 Command injection in Fabric OS
Authenticated low-privilege users can execute arbitrary shell commands with elevated privileges via crafted timezone inputs in Brocade Fabric OS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-87666?
CVE-2026-87666 is a high-severity command injection vulnerability in Broadcom Fabric Operating System, published on 8 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-78
Which versions are affected by CVE-2026-87666?
It affects 1 product.
Products include Broadcom Fabric Operating System.
How do I fix CVE-2026-87666?
No fix has been published for CVE-2026-87666 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-87666 being exploited?
There is no known exploitation of CVE-2026-87666 in the wild and no public exploit code.
Other vulnerabilities in Broadcom Fabric Operating System
Sources
Also known as GHSA-4378-8w2h-3mmx.