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7.3
CVE-2026-109354: LibreNMS before 26.9.0 lets logged-in users view other devices’ data
CVE-2026-109354 · published 23 days ago
Summary
Versions of LibreNMS earlier than 26.9.0 let anyone with a valid account read traffic graphs from devices they should not see by tricking the system with a special channel name. This can expose network usage information from other parts of your infrastructure. Upgrade LibreNMS to version 26.9.0 or newer to close the gap.
What to do
- Update librenms librenms to version 26.9.0 or later.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| librenms | librenms | < 26.9.0 |
Original advisory text
LibreNMS before 26.9.0 Path Traversal via NFSen channel Parameter
LibreNMS before 26.9.0 contains a path traversal vulnerability in nfsen_channel_common.inc.php that allows authenticated users to read unauthorized RRD data by injecting ../ sequences into the channel parameter. Attackers with access to one NFSen-enabled device can request graph.php with a traversed channel value to view traffic and NetFlow graphs of devices outside their authorized scope.
References
- https://github.com/librenms/librenms/security/advisories/GHSA-j3qf-h24w-9f42 Vendor Advisory
- https://www.vulncheck.com/advisories/librenms-before-26.9.0-path-traversal-via-n... Vendor Advisory
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-1093... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-109354 Vendor Advisory
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Severity
7.3
High
Type
CWE-22Path Traversal
Timeline
Published12 Oct 2026
Updated3 Nov 2026
First seen12 Oct 2026
Sources
CVE-2026-109354 · NVD
CVE-2026-109354 · OSV
GHSA-j3qf-h24w-9f42 · GHSA
CVE-2026-109354 · MITRE
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