XSS in Librenms
CVE-2026-109355
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/librenms/librenms/security/advisories/GHSA-cjqw-76mh-jmpv (vendor-advisory)
- www.vulncheck.com/advisories/librenms-before-26.9.0-stored-xss-via-tools-oxidiz… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109355?
- CVE-2026-109355 is a medium-severity vulnerability in Librenms, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-10-12.
- How severe is CVE-2026-109355?
- Medium severity. CVSS v3 base score is 6.1 out of 10.