What’s Vulnerable › Vulnerabilities

CVE-2026-84188: librenms before 26.7.0 Stored XSS via graph_descr settings

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-01 · updated 2026-10-08
• Weakness: CWE-79

Description

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.

Affected products

• librenms: before 26.7.0 — fixed in 26.7.0

How to fix

Upgrade to a fixed version: librenms 26.7.0. Check the vendor advisory for mitigations.

References

• https://github.com/librenms/librenms/security/advisories/GHSA-7cj5-v4pp-v632
• https://www.vulncheck.com/advisories/librenms-before-26.7.0-stored-xss-via-graph-descr-settings
• https://github.com/librenms/librenms/security/advisories/GHSA-7cj5-v4pp-v632

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