CVE-2026-26989mediumCWE-79

CVE-2026-26989: medium-severity vulnerability in librenms

LibreNMS has Stored XSS in Alert Rule

Published

Follow this CVE+ Monitor librenms+ Monitor librenms/librenms

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 4.3epss 0.3%
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.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:L
Affected products
librenms · librenms
Related CVEs — librenms

In the same product, most dangerous first.

CVE-2024-49754HIGHLibreNMS has a stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/api-access.inc.phpEPSS 73.9%CVE-2025-23200MEDIUMStored XSS-LibreNMS-Misc Section in librenmsEPSS 49.3%CVE-2024-50352MEDIUMLibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/device/overview/services.inc.phpEPSS 41.4%CVE-2024-32479HIGHLibreNMS's Improper Sanitization on Service template name leads to Stored XSSEPSS 34.1%CVE-2024-47525HIGHStored XSS ('Cross-site Scripting') in librenms/includes/html/print-alert-rules.phpEPSS 29.6%CVE-2024-32480HIGHLibreNMS's Time-Based Blind SQL injection leads to database extractionEPSS 20.3%