Vulnerability · Published Sep 1, 2026 · Assigned by VulnCheck

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

Medium 4.8

In plain English

A medium-severity cross-site scripting in librenms from librenms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.8Medium

Exploit odds (30 days)0.3%top 83.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Packagist	librenms/librenms	26.7.0	GHSA-7cj5-v4pp-v632

Affected products (as reported)

Vendor	Product	Versions
librenms	librenms	0 – before 26.7.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

References

GitHub Security Advisory (GHSA-7cj5-v4pp-v632) vendor-advisory
VulnCheck Advisory: librenms before 26.7.0 Stored XSS via graph_descr settings third-party-advisory