Moderate severityNVD Advisory· Published Feb 20, 2026· Updated Feb 20, 2026
LibreNMS has Stored XSS in Alert Rule
CVE-2026-26989
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
librenms/librenmsPackagist | < 26.2.0 | 26.2.0 |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-6xmx-xr9p-58p7ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-26989ghsaADVISORY
- github.com/librenms/librenms/commit/087608cf9f851189847cb8e8e5ad002e59170c58ghsax_refsource_MISCWEB
- github.com/librenms/librenms/pull/19039ghsax_refsource_MISCWEB
- github.com/librenms/librenms/releases/tag/26.2.0ghsax_refsource_MISCWEB
- github.com/librenms/librenms/security/advisories/GHSA-6xmx-xr9p-58p7ghsax_refsource_CONFIRMWEB
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