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CVE-2026-27016

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

Published: Feb 20, 2026Updated: Feb 20, 2026 Sources: CVE List NVD GHSACWE-79
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.2%
Top 86.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:LUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79CWE-116

Affected Products

librenmslibrenms
On-prem
Enterprise Software / itsm-monitoring
librenms/librenmsPackagistOSS Libraries
librenmsoss-projectEnterprise Softwareaka librenms/librenms, librenms
packagistpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/librenms/librenms/commit/3bea263e02441690c01dea7fa3fe6ffec94af335
github.com
https://github.com/librenms/librenms/pull/19040
github.com
https://github.com/librenms/librenms/releases/tag/26.2.0
github.com
and 3 more references View all →

Timeline

Published
Feb 20, 2026
Last Updated
Feb 20, 2026

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