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CVE-2026-84193— LibreNMS through 26.2.0 Stored Cross-Site Scripting via SNMP

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.

以下是该漏洞描述的中文翻译： LibreNMS 26.2.0 及更早版本中存在一个存储型跨站脚本（Stored XSS）漏洞，该漏洞存在于渲染未经转义的、源自 SNMP 的数据字段的旧版 PHP 模板页面中，受影响的数据字段包括 BGP 对等体描述、VRF 名称、进程信息以及 SLA 标签。拥有设备管理权限或可通过网络访问以注册一个恶意 SNMP 设备的攻击者，可以注入恶意 JavaScript 代码。当管理员查看受影响的路由或设备页面时，这些脚本将得以执行，从而导致凭证泄露和 CSRF 令牌被窃取。

CVSS 5.8 · Medium
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I. Basic Information for CVE-2026-84193

Vulnerability Information
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Vulnerability Title
LibreNMS through 26.2.0 Stored Cross-Site Scripting via SNMP
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS through 26.2.0 contains a stored cross-site scripting vulnerability in legacy PHP template pages that render unescaped SNMP-sourced data fields including BGP peer descriptions, VRF names, process information, and SLA tags. Attackers with device management access or network access to enroll a rogue SNMP device can inject malicious JavaScript that executes when admins view affected routing and device pages, enabling credential theft and CSRF token exfiltration.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA: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 ~ 26.2.0 -

II. Public POCs for CVE-2026-84193

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III. Intelligence Information for CVE-2026-84193

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Other References for CVE-2026-84193 (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-2026-84192 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-2026-84188 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-2026-84193

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