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CVE-2026-45694— LibreNMS: Reflected XSS in the Proxmox app view via unsanitized instance/vmid parameters

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 26.4.0及之前版本存在跨站脚本漏洞，该漏洞源于Proxmox应用视图对用户提供的instance和vmid GET参数未充分编码，导致反射型跨站脚本攻击，攻击者可能诱使已认证用户点击特制链接，在用户会话中执行脚本，从而窃取会话数据。

CVSS 5.4 · Medium EPSS 0.24% · P13

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
librenms librenms < 26.5.0 affected
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I. Basic Information for CVE-2026-45694

Vulnerability Information
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Vulnerability Title
LibreNMS: Reflected XSS in the Proxmox app view via unsanitized instance/vmid parameters
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS is a network monitoring system. In versions up to and including 26.4.0, the Proxmox application view is vulnerable to reflected cross-site scripting through the user-supplied instance and vmid GET parameters, which are reflected into the page title without adequate encoding. The parameters are placed into the page title with only strip_tags applied, and the title is then written into an inline document.title assignment through string interpolation, so a single quote terminates the JavaScript string and the remaining input runs as script. An attacker who lures an authenticated user into following a crafted link can execute script in that user's session, enabling actions such as theft of session data. This issue is fixed in version 26.5.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/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 26.4.0及之前版本存在跨站脚本漏洞，该漏洞源于Proxmox应用视图对用户提供的instance和vmid GET参数未充分编码，导致反射型跨站脚本攻击，攻击者可能诱使已认证用户点击特制链接，在用户会话中执行脚本，从而窃取会话数据。
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 < 26.5.0 -

II. Public POCs for CVE-2026-45694

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III. Intelligence Information for CVE-2026-45694

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Patches & Fixes for CVE-2026-45694 (1)

Vendor Advisories for CVE-2026-45694 (1)

Same Patch Batch · librenms · 2026-08-26 · 3 CVEs total

CVE-2026-55182 8.6 HIGH LibreNMS: Remote Code Execution by Signal Alert Transportation Module
CVE-2026-80214 8.6 HIGH LibreNMS Virtualisation Discovery Module RCE

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-45694

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