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CVE-2026-84190— LibreNMS before 26.5.0 Remote Code Execution via AboutController

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是LibreNMS社区开源的一款网络监控系统。 LibreNMS 26.5.0之前版本存在命令注入漏洞，该漏洞源于在AboutController中snmpget配置参数未经过正确验证便传递给shell_exec()，可能导致经过身份验证的管理员修改snmpget配置指向恶意可执行文件，并通过访问/about端点触发代码执行。

CVSS 7.2 · High EPSS 0.86% · P58

Affected Version Matrix 2

VendorProduct Version RangeStatus
librenms librenms < 26.5.0 affected
26.5.0 unaffected
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I. Basic Information for CVE-2026-84190

Vulnerability Information
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Vulnerability Title
LibreNMS before 26.5.0 Remote Code Execution via AboutController
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS versions before 26.5.0 contain a remote code execution vulnerability in the AboutController where the snmpget configuration parameter is passed to shell_exec() without proper validation. An authenticated administrator can modify the snmpget configuration to point to a malicious executable file and trigger code execution by accessing the /about endpoint.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
LibreNMS 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibreNMS是LibreNMS社区开源的一款网络监控系统。 LibreNMS 26.5.0之前版本存在命令注入漏洞，该漏洞源于在AboutController中snmpget配置参数未经过正确验证便传递给shell_exec()，可能导致经过身份验证的管理员修改snmpget配置指向恶意可执行文件，并通过访问/about端点触发代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
librenms librenms 0 ~ 26.5.0 -

II. Public POCs for CVE-2026-84190

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III. Intelligence Information for CVE-2026-84190

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Vendor Advisories for CVE-2026-84190 (2)

Same Patch Batch · librenms · 2026-09-01 · 7 CVEs total

CVE-2026-84194 8.6 HIGH LibreNMS 23.10.0 before 26.4.0 OS Command Injection via Hostname
CVE-2026-84189 8.1 HIGH LibreNMS before 26.7.0 Stored XSS via Oxidized API
CVE-2026-84192 7.1 HIGH LibreNMS before 26.3.1 Stored XSS via SNMP/Syslog Data
CVE-2026-84191 6.1 MEDIUM LibreNMS before 26.5.0 Stored XSS via SNMP VRF fields
CVE-2026-84193 5.8 MEDIUM LibreNMS through 26.2.0 Stored Cross-Site Scripting via SNMP
CVE-2026-84188 4.8 MEDIUM librenms before 26.7.0 Stored XSS via graph_descr settings

IV. Related Vulnerabilities

Same product: librenms
Same vendor: librenms
Same weakness: CWE-77

V. Comments for CVE-2026-84190

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