What is the CVSS score of CVE-2026-26992?

CVE-2026-26992 has a CVSS 3.1 base score of 4.8 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Which versions of SNMP are affected by CVE-2026-26992?

Organizations using LibreNMS should be aware of moderate risk from CVE-2026-26992, a cross-site scripting vulnerability rated CVSS 4.8.. A patch is available.

Is there a public PoC exploit available for CVE-2026-26992?

Yes, a public proof-of-concept exploit is available for CVE-2026-26992. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-26992?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

SNMP CVE-2026-26992

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-02-20 security-advisories@github.com

GHSA-93fx-g747-695x

XSS SNMP MySQL Librenms

4.8

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

4.8 MEDIUM

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:04 vuln.today

PoC Detected

Feb 20, 2026 - 16:20 vuln.today

Public exploit code

Patch released

Feb 20, 2026 - 16:20 nvd

Patch available

CVE Published

Feb 20, 2026 - 03:16 nvd

MEDIUM 4.8

DescriptionGitHub Advisory

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.

AnalysisAI

Stored XSS in LibreNMS versions 26.1.1 and below allows authenticated administrators to inject malicious scripts through unsanitized port group names, which execute when other users view the affected port group. Public exploit code exists for this vulnerability. The issue is resolved in version 26.2.0.

Technical ContextAI

Classified as CWE-79 (Cross-site Scripting (XSS)). Affects the value of the name component of Librenms. 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 b

RemediationAI

A vendor patch is available — apply it immediately. Fixed in version 26.2.0.. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.