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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (15.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.5% 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-7cj5-v4pp-v632 (vendor-advisory)
- www.vulncheck.com/advisories/librenms-before-26.7.0-stored-xss-via-graph-descr-… (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.