CVE-2026-55182
Severity CVSS v4.0:
HIGH
Type:
CWE-77
Command Injection
Publication date:
26/08/2026
Last modified:
26/08/2026
Description
LibreNMS is a network monitoring system. In versions from 21.6.0 up to 26.5.0, the Signal alert transport is vulnerable to command injection because the signal-cli path and the Recipient field of an alert transport entry are insufficiently escaped before being passed to an exec call. An authenticated administrator can craft a transport entry whose Recipient contains shell metacharacters and whose path points to the bundled composer_wrapper.php script, which itself passes attacker-controlled input to further unsafe exec calls. By chaining these calls, the administrator can execute arbitrary operating-system commands on the LibreNMS host. This issue is fixed in version 26.5.0.
Impact
Base Score 4.0
8.60
Severity 4.0
HIGH