Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Librenms | Librenms | >= 24.10.0, < 26.2.0 |
Related Weaknesses (CWE)
References
- https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94aPatch
- https://github.com/librenms/librenms/pull/19040Issue Tracking
- https://github.com/librenms/librenms/releases/tag/26.2.0ProductRelease Notes
- https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55gThird Party Advisory
FAQ
What is CVE-2026-27016?
CVE-2026-27016 is a vulnerability with a CVSS score of 5.4 (MEDIUM). 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 function...
How severe is CVE-2026-27016?
CVE-2026-27016 has been rated MEDIUM with a CVSS base score of 5.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-27016?
Check the references section above for vendor advisories and patch information. Affected products include: Librenms Librenms.