CVE-2026-84189: Improper Neutralization of Input During Web Page Generation

LibreNMS through 26.4.0 renders JSON fields name, ip, model, author, commit message returned by the admin-configurable Oxidized integration URL oxidized.url into the device showconfig page without applying htmlspecialchars. An administrator who points the Oxidized URL at an attacker-controlled...

CVE-2026-84192: Improper Neutralization of Input During Web Page Generation

LibreNMS before 26.3.1 contains a stored cross-site scripting vulnerability in legacy PHP templates that output SNMP-sourced and syslog-sourced data without escaping. An attacker who controls a monitored network device can inject arbitrary JavaScript through SNMP interface descriptions or syslog...

CVE-2026-84194: Improper Neutralization of Special Elements used in an OS Command

LibreNMS versions = 23.10.0 and getDevice-hostname is concatenated into shell commands ssh, virsh list/dumpxml/domstate in VminfoLibvirt.php and passed to exec without escapeshellarg or argument separation. An authenticated admin can set a crafted device hostname to inject arbitrary OS commands,...

CVE-2026-84188: Improper Neutralization of Input During Web Page Generation

LibreNMS versions = 26.4.0 contain a stored cross-site scripting vulnerability in the graphdescr. configuration settings, which are echoed verbatim without HTML escaping in includes/html/pages/graphs.inc.php. An administrator can store a malicious HTML payload that executes in the browser of any...

PT-2026-84154

LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in VRF display pages where mplsVpnVrfDescription, vrf name, and mplsVpnVrfRouteDistinguisher fields from SNMP polling are rendered without sanitization. Attackers controlling a monitored network device can inject arbitrar...

PT-2026-84152

LibreNMS through 26.4.0 renders JSON fields name, ip, model, author, commit message returned by the admin-configurable Oxidized integration URL oxidized.url into the device showconfig page without applying htmlspecialchars. An administrator who points the Oxidized URL at an attacker-controlled...

PT-2026-84157

LibreNMS versions = 23.10.0 and getDevice-hostname is concatenated into shell commands ssh, virsh list/dumpxml/domstate in VminfoLibvirt.php and passed to exec without escapeshellarg or argument separation. An authenticated admin can set a crafted device hostname to inject arbitrary OS commands,...

PT-2026-84151

LibreNMS versions configuration settings, which are echoed verbatim without HTML escaping in includes/html/pages/graphs.inc.php. An administrator can store a malicious HTML payload that executes in the browser of any authenticated user who views the affected graph type. The issue is fixed in...

PT-2026-84155

LibreNMS before 26.3.1 contains a stored cross-site scripting vulnerability in legacy PHP templates that output SNMP-sourced and syslog-sourced data without escaping. An attacker who controls a monitored network device can inject arbitrary JavaScript through SNMP interface descriptions or syslog...

PT-2026-84153

LibreNMS versions before 26.5.0 contain a remote code execution vulnerability in the AboutController where the snmpget configuration parameter is passed to shell exec without proper validation. An authenticated administrator can modify the snmpget configuration to point to a malicious executable...

CVE-2026-84190: Improper Neutralization of Special Elements used in a Command

LibreNMS versions before 26.5.0 contain a remote code execution vulnerability in the AboutController where the snmpget configuration parameter is passed to shellexec without proper validation. An authenticated administrator can modify the snmpget configuration to point to a malicious executable...

CVE-2026-84193: Improper Neutralization of Input During Web Page Generation

LibreNMS through 26.2.0 contains a stored cross-site scripting vulnerability in legacy PHP template pages that render unescaped SNMP-sourced data fields including BGP peer descriptions, VRF names, process information, and SLA tags. Attackers with device management access or network access to enro...

CVE-2026-55182

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...

CVE-2026-45694

LibreNMS is a network monitoring system. In versions up to and including 26.4.0, the Proxmox application view is vulnerable to reflected cross-site scripting through the user-supplied instance and vmid GET parameters, which are reflected into the page title without adequate encoding. The paramete...

CVE-2026-55182 LibreNMS: Remote Code Execution by Signal Alert Transportation Module

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...

EUVD-2026-66774

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...

CVE-2026-55182 LibreNMS: Remote Code Execution by Signal Alert Transportation Module

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...

CVE-2026-55182 LibreNMS: Remote Code Execution by Signal Alert Transportation Module

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...

CVE-2026-55182

LibreNMS , a network monitoring system, is vulnerable to command injection in the Signal alert transport module (versions 21.6.0 through 26.5.0). The root cause lies in insufficiently escaped signal-cli path and Recipient field in the deliverAlert function of Signal.php, which are passed to unsaf...

CVE-2026-45694 LibreNMS: Reflected XSS in the Proxmox app view via unsanitized instance/vmid parameters

LibreNMS is a network monitoring system. In versions up to and including 26.4.0, the Proxmox application view is vulnerable to reflected cross-site scripting through the user-supplied instance and vmid GET parameters, which are reflected into the page title without adequate encoding. The paramete...