CVE-2026-109355: LibreNMS before 26.9.0 Stored XSS via Tools Oxidized Node List

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-12 · updated 2026-10-16
Weakness: CWE-79

Description

LibreNMS before 26.9.0 contains a stored cross-site scripting vulnerability in get_oxidized_nodes_list() that renders Oxidized API fields and SNMP sysName unescaped. Attackers controlling the Oxidized response or a device's SNMP sysName can inject script that executes in browsers of users viewing the Tools Oxidized page.

Affected products

librenms: before 26.9.0 — fixed in 26.9.0

How to fix

Upgrade to a fixed version: librenms 26.9.0. Check the vendor advisory for mitigations.

References

https://github.com/librenms/librenms/security/advisories/GHSA-cjqw-76mh-jmpv
https://www.vulncheck.com/advisories/librenms-before-26.9.0-stored-xss-via-tools-oxidized-node-list

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