CVE-2026-84192

EUVD-2026-69029
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 program fields that executes when authenticated users view affected pages.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
7.1 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
librenmslibrenms
𝑥
< 26.3.1
CNA
Common Weakness Enumeration
References
https://github.com/librenms/librenms/security/advisories/GHSA-7w8c-qgxg-m7jx
https://www.vulncheck.com/advisories/librenms-before-26.3.1-stored-xss-via-snmp-syslog-data
https://github.com/librenms/librenms/security/advisories/GHSA-7w8c-qgxg-m7jx