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CVE-2026-84188— librenms before 26.7.0 Stored XSS via graph_descr settings

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 版本 ≤ 26.4.0 中存在一个存储型跨站脚本（Stored XSS）漏洞。该漏洞位于 配置项中，相关配置值在 文件中被原样输出且未经过 HTML 转义。攻击者（管理员）可以存储一个恶意的 HTML 载荷，该载荷会在任何查看受影响图表类型的已认证用户浏览器中执行。该问题已在版本 26.7.0 中修复。

CVSS 4.8 · Medium

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-84188

Vulnerability Information
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Vulnerability Title
librenms before 26.7.0 Stored XSS via graph_descr settings
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS versions <= 26.4.0 contain a stored cross-site scripting vulnerability in the graph_descr.<graphtype> configuration settings, which are echoed verbatim without HTML escaping in includes/html/pages/graphs.inc.php. An administrator can store a malicious HTML payload that executes in the browser of any authenticated user who views the affected graph type. The issue is fixed in version 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: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 ~ 26.7.0 -

II. Public POCs for CVE-2026-84188

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III. Intelligence Information for CVE-2026-84188

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Other References for CVE-2026-84188 (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-2026-84193 5.8 MEDIUM LibreNMS through 26.2.0 Stored Cross-Site Scripting via SNMP

IV. Related Vulnerabilities

Same product: librenms
Same vendor: librenms
Same weakness: CWE-79

V. Comments for CVE-2026-84188

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