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CVE-2026-84192— LibreNMS before 26.3.1 Stored XSS via SNMP/Syslog Data

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 在 26.3.1 之前的版本中，存在一个存储型跨站脚本（XSS）漏洞，影响其遗留 PHP 模板，这些模板在输出 SNMP 来源和 syslog 来源的数据时未进行转义处理。攻击者若能够控制被监控的网络设备，就可以通过 SNMP 接口描述字段或 syslog 程序名（program）字段注入任意 JavaScript 代码，当经过身份验证的用户浏览受影响的页面时，该代码将被执行。

CVSS 7.1 · High

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-84192

Vulnerability Information
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Vulnerability Title
LibreNMS before 26.3.1 Stored XSS via SNMP/Syslog Data
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS before 26.3.1 contains a stored cross-site scripting vulnerability in legacy PHP templates that output SNMP-sourced and syslog-sourced data without escaping. An attacker who controls a monitored network device can inject arbitrary JavaScript through SNMP interface descriptions or syslog program fields that executes when authenticated users view affected pages.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
librenms librenms 0 ~ 26.3.1 -

II. Public POCs for CVE-2026-84192

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III. Intelligence Information for CVE-2026-84192

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Other References for CVE-2026-84192 (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-2026-84190 7.2 HIGH LibreNMS before 26.5.0 Remote Code Execution via AboutController
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-79

V. Comments for CVE-2026-84192

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