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

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.

在版本 26.9.0 之前的 LibreNMS 中存在一个缺少授权检查的漏洞，位于 PortsController::purge 方法中。该漏洞允许具有全局只读权限的用户物理删除端口，而无需具备删除权限。拥有只读账户的攻击者可以向 /ports/purge 发送 DELETE 请求，并使用 purge=all 参数，从而不可逆地清除所有可见设备上已删除的端口。

CVSS 4.3 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood

Affected Version Matrix 2

VendorProduct Version RangeStatus
librenms librenms < 26.9.0 affected
26.9.0 unaffected
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I. Basic Information for CVE-2026-109356

Vulnerability Information
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Vulnerability Title
LibreNMS before 26.9.0 Missing Authorization in Port Purge via PortsController
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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-2026-109356

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III. Intelligence Information for CVE-2026-109356

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Vendor Advisories for CVE-2026-109356 (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-2026-109354 4.3 MEDIUM LibreNMS before 26.9.0 Path Traversal via NFSen channel Parameter

IV. Related Vulnerabilities

Same product: librenms
Same vendor: librenms
Same weakness: CWE-862

V. Comments for CVE-2026-109356

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