This vulnerability (CVE-2026-9155) in Rapid7 InsightConnect Sed Plugin arises from improper neutralization of special elements in OS commands (CWE-78). Authenticated users can exploit insufficient input validation on the expression parameter to execute arbitrary OS commands on Linux systems running the plugin. The CVSS 3.1 base score is 8.8, reflecting network attack vector, low attack complexity, required privileges, no user interaction, and high impact on confidentiality, integrity, and availability. No vendor advisory or patch information is currently available, and the product is not a cloud service.

Successful exploitation allows an authenticated attacker to execute arbitrary OS commands on the underlying Linux system, potentially leading to full compromise of the affected host, including confidentiality, integrity, and availability impacts.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the InsightConnect Sed Plugin to trusted users only and monitor for suspicious activity related to command execution. Follow vendor updates closely for official patches or mitigations.