CVE-2026-27016

LibreNMS has Stored XSS in Custom OID - unit parameter missing strip_tags()

CVSS 5.4 MEDIUMEPSS 0.2%CWE-116 CWE-79

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.4EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

20 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

librenms · librenms

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References

https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335 https://github.com/librenms/librenms/pull/19040 https://github.com/librenms/librenms/releases/tag/26.2.0 https://github.com/librenms/librenms/security/advisories/GHSA-fqx6-693c-f55g