What is CVE-2026-84188?

CVE-2026-84188 is a medium-severity vulnerability in Librenms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-09-01.

How severe is CVE-2026-84188?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Librenms

CVE-2026-84188

LibreNMS versions <= 26.4.0 contain a stored cross-site scripting vulnerability in the graph_descr.<graphtype> 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 version 26.7.0.

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/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-2026-84188?: CVE-2026-84188 is a medium-severity vulnerability in Librenms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-09-01.
How severe is CVE-2026-84188?: Medium severity. CVSS v3 base score is 4.8 out of 10.