CVE-2026-109352 LibreNMS before 26.9.0 Stored XSS via wireless sensor description
Attackers controlling SNMP agents can inject malicious scripts into wireless sensor descriptions, leading to session hijacking of authenticated users viewing device details.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-109352?
CVE-2026-109352 is a medium-severity cross-site scripting vulnerability in librenms, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-109352?
How do I fix CVE-2026-109352?
No fix has been published for CVE-2026-109352 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-109352 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-109352 exists.
Sources
Also known as GHSA-4f47-pwgv-rph4, GHSA-ffjc-4fr5-47c6.