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CVE-2026-109354— LibreNMS before 26.9.0 Path Traversal via NFSen channel Parameter

Quick assessment

Affected
librenms librenms
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LibreNMS 26.9.0 之前的版本在 nfsen_channel_common.inc.php 中存在路径遍历漏洞，攻击者可以通过向 channel 参数注入 ../ 序列，以允许认证用户读取未授权的 RRD 数据。具有一个启用了 NFSen 的设备访问权限的攻击者可以通过请求 graph.php 并提供一个经过遍历处理的 channel 值，查看超出其授权范围设备的流量和 NetFlow 图表。

CVSS 4.3 · Medium

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-109354

Vulnerability Information
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Vulnerability Title
LibreNMS before 26.9.0 Path Traversal via NFSen channel Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
librenms librenms 0 ~ 26.9.0 -

II. Public POCs for CVE-2026-109354

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III. Intelligence Information for CVE-2026-109354

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Other References for CVE-2026-109354 (2)

Same Patch Batch · librenms · 2026-10-12 · 6 CVEs total

CVE-2026-109357 8.1 HIGH LibreNMS before 26.9.0 LDAP Filter Injection Authentication Bypass via Authorization Heade
CVE-2026-109353 7.1 HIGH LibreNMS before 26.9.0 SQL Injection via notification_id in notifications.inc.php
CVE-2026-109355 6.1 MEDIUM LibreNMS before 26.9.0 Stored XSS via Tools Oxidized Node List
CVE-2026-109352 6.1 MEDIUM LibreNMS before 26.9.0 Stored XSS via wireless sensor description
CVE-2026-109356 4.3 MEDIUM LibreNMS before 26.9.0 Missing Authorization in Port Purge via PortsController

IV. Related Vulnerabilities

Same product: librenms
Same vendor: librenms
Same weakness: CWE-22

V. Comments for CVE-2026-109354

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