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CVE-2026-26989— LibreNMS has Stored XSS in Alert Rule

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 25.12.0及之前版本存在跨站脚本漏洞，该漏洞源于Alert Rules工作流处理不当，可能导致存储型跨站脚本攻击。

CVSS 4.3 · Medium EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2026-26989

Vulnerability Information
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Vulnerability Title
LibreNMS has Stored XSS in Alert Rule
Source: CVE Program / CVE List V5
Vulnerability Description
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 25.12.0 and below are affected by a Stored Cross-Site Scripting (XSS) vulnerability in the Alert Rules workflow. An attacker with administrative privileges can inject malicious scripts that execute in the browser context of any user who accesses the Alert Rules page. This issue has been fixed in version 26.2.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L
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 25.12.0及之前版本存在跨站脚本漏洞，该漏洞源于Alert Rules工作流处理不当，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 < 26.2.0 -

II. Public POCs for CVE-2026-26989

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III. Intelligence Information for CVE-2026-26989

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Vendor Pages for CVE-2026-26989 (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-2026-27016 5.4 MEDIUM LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()
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-2026-26989

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