CVE-2026-109352

6.1Medium

Published 12 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash

6.1Medium

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: Required
Impact: Limited impact
Weakness: CWE-79

Impact

Attackers can hijack user sessions and run arbitrary scripts in the browser when an authenticated user views the Wireless tab. The attacker must control the SNMP agent on a monitored device to inject the malicious payload into SNMP fields.

Root cause

The application echoes wireless sensor descriptions (sensor_descr) fetched via SNMP directly into HTML without output escaping in includes/html/pages/device/wireless.inc.php.

Affected systems

LibreNMS versions prior to 26.9.0

CVSS v3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Fix & remediation

Upgrade LibreNMS to version 26.9.0 or later. If upgrading immediately is not possible, restrict SNMP access or stop monitoring untrusted devices that feed into the Wireless tab.

shell

$ ./daily.sh

AI-suggested. Run it in staging first and check it against the vendor advisory. Why?

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NVD 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.

References

Source: nvd.nist.gov/vuln/detail/CVE-2026-109352