CVE-2026-84188 librenms before 26.7.0 Stored XSS via graph_descr settings
An administrator can inject malicious scripts into graph descriptions, leading to code execution in the browsers of other authenticated users.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-84188?
CVE-2026-84188 is a medium-severity cross-site scripting vulnerability in librenms, published on 1 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-84188?
2 open source packages ship an affected version, including librenms/librenms.
| Package | Affected | Fixed in |
|---|---|---|
librenms/librenms Packagist | All versions | 26.7.0 |
librenms/librenms Packagist | All versions | 26.7.0 |
How do I fix CVE-2026-84188?
Upgrade librenms/librenms to 26.7.0 or later.
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-2026-84188 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-84188 exists.
Sources
Also known as GHSA-7cj5-v4pp-v632, GHSA-pvwj-jwv3-68ww.