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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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.

LibreNMS是LibreNMS社区开源的一款网络监控系统。 LibreNMS 26.2.0及之前版本存在跨站脚本漏洞，该漏洞源于遗留PHP模板页面渲染未转义的SNMP数据字段，包括BGP对等体描述、VRF名称、进程信息和SLA标签，可能导致存储型跨站脚本攻击，攻击者注入恶意JavaScript，在管理员查看受影响页面时执行，导致凭据窃取和CSRF令牌泄露。

CVSS 5.8 · Medium EPSS 0.35% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
librenms librenms ≤ 26.2.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-84193

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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
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 26.2.0及之前版本存在跨站脚本漏洞，该漏洞源于遗留PHP模板页面渲染未转义的SNMP数据字段，包括BGP对等体描述、VRF名称、进程信息和SLA标签，可能导致存储型跨站脚本攻击，攻击者注入恶意JavaScript，在管理员查看受影响页面时执行，导致凭据窃取和CSRF令牌泄露。
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 ~ 26.2.0 -

II. Public POCs for CVE-2026-84193

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-84193

请登录查看更多情报信息。

Vendor Advisories 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

No comments yet

Leave a comment