Medium severity · published Feb 20, 2026
CVE-2026-26992
LibreNMS has Stored Cross-Site Scripting via unsanitized /port-groups name
4.8
CVSS
0.2%
EPSS
No
On KEV
Description
LibreNMS is an auto-discovering PHP/MySQL/SNMP based network monitoring tool. In versions 26.1.1 and below, the port group name is not sanitized, allowing attackers with admin privileges to perform Stored Cross-Site Scripting (XSS) attacks. When a user adds a port group, an HTTP POST request is sent to the Request-URI "/port-groups". The name of the newly created port group is stored in the value of the name parameter. After the port group is created, the entry is displayed along with relevant buttons such as Edit and Delete. This issue has been fixed in version 26.2.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
librenms · librenms
< 26.2.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-26992
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-26992
Patch
https://github.com/librenms/librenms/commit/882fe6f90ea504a3732f83caf89bba7850a5699f
Issue Tracking
https://github.com/librenms/librenms/pull/19042
Product
https://github.com/librenms/librenms/releases/tag/26.2.0
Exploit
https://github.com/librenms/librenms/security/advisories/GHSA-93fx-g747-695x
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