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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.

26.5.0 之前的 LibreNMS 在 VRF 显示页面中存在存储型跨站脚本（XSS）漏洞。该漏洞源于从 SNMP 轮询获取的、和字段在未经验证和清理（sanitization）的情况下直接渲染。攻击者若能控制被监控的网络设备，便可通过 SNMP 响应注入任意 JavaScript 代码，该代码将在查看 VRF 相关页面的任何用户的浏览器中执行。

CVSS 6.1 · Medium Updated Sep 01, 2026

Possible ATT&CK Techniques 1 AI

T1189.002

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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

Affected Products

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

II. Public POCs for CVE-2026-84191

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-84191

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Other References for CVE-2026-84191 (2)

https://github.com/librenms/librenms/security/advisories/GHSA-g993-wffj-m3gv vendor-advisory
https://www.vulncheck.com/advisories/librenms-before-26.5.0-stored-xss-via-snmp-vrf-fields third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-84191

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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Goal Reached Thanks to every supporter — we hit 100%!

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

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2026-84191

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-84191

III. Intelligence Information for CVE-2026-84191

Other References for CVE-2026-84191 (2)

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

IV. Related Vulnerabilities

V. Comments for CVE-2026-84191

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