CVE-2026-84193

Medium

Description

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 enroll a rogue SNMP device can inject malicious JavaScript that executes when admins view affected routing and device pages, enabling credential theft and CSRF token exfiltration.

SeverityMedium

CVSS5.8

Exploit probability—

ProductLibrenms

PublishedSep 1, 2026

First seenSep 1, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Vendor advisories

github.com/librenms/librenms/security/advisories/GHSA-v5jp-f342-234h

Affected products

Product	Affected versions	Fixed in
librenms librenms	v ≤ 26.2.0	—

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