CVE-2026-26989

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.

• CWE-79

• https://github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58Patch
• https://github.com/librenms/librenms/pull/19039Issue Tracking
• https://github.com/librenms/librenms/releases/tag/26.2.0Product, Release Notes
• https://github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7Exploit, Third Party Advisory

Published

Feb 20, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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