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CVE-2026-84191— LibreNMS before 26.5.0 Stored XSS via SNMP VRF fields

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之前版本存在跨站脚本漏洞，该漏洞源于VRF显示页面中mplsVpnVrfDescription、vrf_name和mplsVpnVrfRouteDistinguisher字段来自SNMP轮询未经过清理渲染，可能导致存储型跨站脚本攻击。

CVSS 6.1 · Medium EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1189.002

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-2026-84191

Vulnerability Information
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Vulnerability Title
LibreNMS before 26.5.0 Stored XSS via SNMP VRF fields
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in VRF display pages where mplsVpnVrfDescription, vrf_name, and mplsVpnVrfRouteDistinguisher fields from SNMP polling are rendered without sanitization. Attackers controlling a monitored network device can inject arbitrary JavaScript through SNMP responses that executes in the browser of any user viewing VRF-related pages.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/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
Vulnerability Title
LibreNMS 跨站脚本漏洞
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之前版本存在跨站脚本漏洞，该漏洞源于VRF显示页面中mplsVpnVrfDescription、vrf_name和mplsVpnVrfRouteDistinguisher字段来自SNMP轮询未经过清理渲染，可能导致存储型跨站脚本攻击。
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-2026-84191

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III. Intelligence Information for CVE-2026-84191

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Vendor Advisories for CVE-2026-84191 (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-2026-84193 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-2026-84191

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