What is CVE-2026-84192?

CVE-2026-84192 is a high-severity vulnerability in Librenms, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-09-01.

How severe is CVE-2026-84192?

High severity. CVSS v3 base score is 7.1 out of 10.

XSS in Librenms

CVE-2026-84192

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.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N.

Affected products

Librenms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-84192?: CVE-2026-84192 is a high-severity vulnerability in Librenms, classified under Cross-site Scripting. CVSS score: 7.1/10. Published 2026-09-01.
How severe is CVE-2026-84192?: High severity. CVSS v3 base score is 7.1 out of 10.