Auth bypass in Librenms
CVE-2026-109356
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.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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-9qcg-rgg9-mpjg (vendor-advisory)
- www.vulncheck.com/advisories/librenms-before-26.9.0-missing-authorization-in-po… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109356?
- CVE-2026-109356 is a medium-severity vulnerability in Librenms, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-10-12.
- How severe is CVE-2026-109356?
- Medium severity. CVSS v3 base score is 4.3 out of 10.