CVE-2026-109352

Medium

Description

LibreNMS before 26.9.0 contains a stored cross-site scripting vulnerability in includes/html/pages/device/wireless.inc.php, which echoes wireless sensor sensor_descr values, populated from SNMP DisplayString fields during discovery, into HTML without escaping. Attackers controlling a monitored device's SNMP agent can set values such as AI-AP-MIB::aiSSID to malicious JavaScript that executes when authenticated users view the device's Wireless tab, enabling session hijacking.

SeverityMedium

CVSS6.1

Exploit probability—

ProductLibrenms

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

librenms librenms26.9.0 or later

Vendor advisories

github.com/librenms/librenms/security/advisories/GHSA-ffjc-4fr5-47c6

Affected products

Product	Affected versions	Fixed in
librenms librenms	v < 26.9.0	26.9.0

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