CVE-2026-106171 in FortiManager
Summary
by MITRE • 10/13/2026
A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiManager 8.0.0, FortiManager 7.6.0 through 7.6.6, FortiManager Cloud 7.6.2 through 7.6.6 may allow attacker to escalation of privilege via specially crafted packets
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified as an improper neutralization of special elements used in an OS command represents a critical security flaw within the Fortinet FortiManager suite, specifically affecting versions 8.0.0 and the 7.6.x branch including cloud deployments. This class of defect is technically categorized under CWE-78, which defines Improper Neutralization of Special Elements used in an Operating System Command, commonly known as OS command injection. The core technical flaw lies in the application's failure to adequately sanitize or validate user-supplied input before it is passed directly to underlying operating system commands for execution. When a specially crafted packet containing malicious shell metacharacters such as semicolons, pipes, ampersands, or backticks reaches the vulnerable component, the FortiManager software interprets these characters not merely as data but as executable instructions. This misinterpretation allows an attacker to inject arbitrary operating system commands that are then executed with the privileges of the service running the application.
The operational impact of this vulnerability is severe due to its potential for privilege escalation. By exploiting this injection point, a remote unauthenticated or authenticated attacker can achieve code execution on the underlying host system. Since FortiManager typically runs as a privileged user to manage network devices and configurations, successful exploitation grants the attacker elevated access rights equivalent to those of the application process. This effectively compromises the integrity, confidentiality, and availability of the management infrastructure. An adversary could use this foothold to exfiltrate sensitive configuration data from managed firewalls, modify security policies to weaken organizational defenses, or pivot further into the internal network by leveraging the compromised manager as a staging ground for additional attacks against other connected assets.
From an offensive security perspective, this vulnerability aligns with MITRE ATT&CK technique T1059 Command and Scripting Interpreter, specifically sub-techniques involving shell commands such as sh or bash. The attack vector involves crafting network packets that trigger the vulnerable code path within FortiManager's web interface or API endpoints. Once executed, the injected commands allow for arbitrary file read/write operations, reverse shell establishment, or installation of persistent backdoors. This capability transforms a simple input validation error into a full system compromise scenario, undermining the trust model inherent in centralized network management systems where administrators rely on the manager to enforce security boundaries across their estate.
Mitigation strategies must prioritize immediate patching and access control hardening. Fortinet has released updated versions of FortiManager that address this issue by implementing strict input validation and output encoding mechanisms to prevent special characters from being interpreted as command syntax. Organizations should upgrade to a patched version immediately, ensuring they select the appropriate release branch based on their current deployment environment. In cases where immediate patching is not feasible due to operational constraints or testing requirements, network-level mitigations are essential. This includes restricting access to FortiManager management interfaces exclusively through trusted IP addresses using firewalls or VPNs, and implementing Web Application Firewalls configured with rulesets designed to detect and block OS command injection patterns such as common shell metacharacters in HTTP request parameters. Additionally, enabling multi-factor authentication for administrative accounts adds a layer of defense against unauthorized exploitation attempts by ensuring that even if the vulnerability is triggered, the attacker cannot easily maintain persistent access without additional credentials.