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

CVE ID : CVE-2026-26989

Published : Feb. 20, 2026, 2:16 a.m. | 44 minutes ago

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.

Severity: 4.3 | MEDIUM

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