CVE-2026-109355 LibreNMS before 26.9.0 Stored XSS via Tools Oxidized Node List
Attackers can inject malicious scripts via Oxidized API or SNMP sysName, leading to code execution in victim browsers viewing the Tools Oxidized page.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-109355?
CVE-2026-109355 is a medium-severity cross-site scripting vulnerability in librenms, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-109355?
How do I fix CVE-2026-109355?
No fix has been published for CVE-2026-109355 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-109355 being exploited?
There is no known exploitation of CVE-2026-109355 in the wild and no public exploit code.
Sources
Also known as GHSA-cjqw-76mh-jmpv, GHSA-m63v-9j9m-6j88.