CVE-2026-109356: LibreNMS before 26.9.0 Missing Authorization in Port Purge via PortsController

Severity: medium (CVSS 4.3 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 2026-10-26
Weakness: CWE-862

Description

LibreNMS before 26.9.0 contains a missing authorization vulnerability in PortsController::purge that allows global-read users to physically delete ports without delete privileges. Attackers with read-only accounts can send DELETE requests to /ports/purge, using purge=all to irreversibly erase every deleted port on all visible devices.

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-9qcg-rgg9-mpjg
https://www.vulncheck.com/advisories/librenms-before-26.9.0-missing-authorization-in-port-purge-via-portscontroller

Get alerted when CVE-2026-109356 or the next vulnerability affects your stack