CVE-2026-27016
Medium
Description
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. Versions 24.10.0 through 26.1.1 are vulnerable to Stored XSS via the unit parameter in Custom OID. The Custom OID functionality lacks strip_tags() sanitization while other fields (name, oid, datatype) are sanitized. The unsanitized value is stored in the database and rendered without HTML escaping. This issue is fixed in version 26.2.0.
SeverityMedium
CVSS5.4
Exploit probability—
ProductLibrenms
PublishedFeb 20, 2026
First seenFeb 20, 2026
Weakness typeCWE-79Cross-site scripting (XSS)CWE-116CWE-116
How to fix
Update
- librenms librenms26.2.0 or later
- librenms/librenms26.2.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| librenms librenms | 24.10.0 ≤ v < 26.2.0 | 26.2.0 |
| librenms/librenmsPackagist | 24.10.0 ≤ v < 26.2.0 | 26.2.0 |
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