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CVE-2026-27016— LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()

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社区的一套基于PHP和MySQL的开源网络监控系统。该系统具有自定义警报、自动发现网络环境和自动更新等特点。 LibreNMS 24.10.0版本至26.1.1版本存在安全漏洞，该漏洞源于Custom OID功能中unit参数清理和转义不足，可能导致存储型跨站脚本攻击。

CVSS 5.4 · Medium EPSS 0.32% · P23
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I. Basic Information for CVE-2026-27016

Vulnerability Information
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Vulnerability Title
LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 24.10.0 through 26.1.1 are vulnerable to Stored XSS via the unit parameter in Custom OID. The Custom OID functionality lacks strip_tags() sanitization while other fields (name, oid, datatype) are sanitized. The unsanitized value is stored in the database and rendered without HTML escaping. This issue is fixed in version 26.2.0.
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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LibreNMS是LibreNMS社区的一套基于PHP和MySQL的开源网络监控系统。该系统具有自定义警报、自动发现网络环境和自动更新等特点。 LibreNMS 24.10.0版本至26.1.1版本存在安全漏洞，该漏洞源于Custom OID功能中unit参数清理和转义不足，可能导致存储型跨站脚本攻击。
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 >= 24.10.0, < 26.2.0 -

II. Public POCs for CVE-2026-27016

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III. Intelligence Information for CVE-2026-27016

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Vendor Advisories for CVE-2026-27016 (1)

Vendor Pages for CVE-2026-27016 (1)

Same Patch Batch · librenms · 2026-02-20 · 7 CVEs total

CVE-2026-26990 8.8 HIGH LibreNMS has Time-Based Blind SQL Injection in address-search.inc.php
CVE-2026-26989 4.3 MEDIUM LibreNMS has Stored XSS in Alert Rule
CVE-2026-26992 LibreNMS has Stored Cross-Site Scripting via unsanitized /port-groups name
CVE-2026-26991 LibreNMS vulnerable to Stored Cross-site Scripting through unsanitized /device-groups name
CVE-2026-26988 LibreNMS: SQL Injection in ajax_table.php spreads through a covert data stream
CVE-2026-26987 LibreNMS affected by reflected XSS via email field

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-27016

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