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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (24.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/librenms/librenms/security/advisories/GHSA-7w8c-qgxg-m7jx (vendor-advisory)
- www.vulncheck.com/advisories/librenms-before-26.3.1-stored-xss-via-snmp-syslog-… (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.