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CVE-2026-84189— LibreNMS before 26.7.0 Stored XSS via Oxidized API

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.

在 LibreNMS 26.4.0 及更早版本中，系统会将管理员可配置的 Oxidized 集成接口（oxidized.url）返回的 JSON 字段（包括 name、ip、model、author、commit message）直接渲染到设备的 showconfig 页面，且未使用 htmlspecialchars() 进行转义。 若管理员将该 Oxidized URL 指向攻击者控制的服务器（SSRF 场景），攻击者可让该服务器返回包含恶意 JavaScript 的 JSON 数据，从而引发存储型/持久型跨站脚

CVSS 8.1 · High
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I. Basic Information for CVE-2026-84189

Vulnerability Information
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Vulnerability Title
LibreNMS before 26.7.0 Stored XSS via Oxidized API
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS through 26.4.0 renders JSON fields (name, ip, model, author, commit message) returned by the admin-configurable Oxidized integration URL (oxidized.url) into the device showconfig page without applying htmlspecialchars(). An administrator who points the Oxidized URL at an attacker-controlled server (SSRF) can cause it to return malicious JSON, resulting in stored/persistent cross-site scripting affecting all users who view any device's showconfig tab. Fixed in 26.7.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/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 ~ 26.7.0 -

II. Public POCs for CVE-2026-84189

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III. Intelligence Information for CVE-2026-84189

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Other References for CVE-2026-84189 (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-2026-84190 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-2026-84193 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-2026-84189

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