LibreNMS up to 26.4.x VRF Display Pages cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k2.03+

Summaryinfo

A vulnerability was found in LibreNMS up to 26.4.x and classified as problematic. The affected element is an unknown function of the component VRF Display Pages. The manipulation of the argument mplsVpnVrfDescription/vrf_name/mplsVpnVrfRouteDistinguisher results in cross site scripting. This vulnerability is known as CVE-2026-84191. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in LibreNMS up to 26.4.x. It has been classified as problematic. Affected is an unknown code of the component VRF Display Pages. The manipulation of the argument mplsVpnVrfDescription/vrf_name/mplsVpnVrfRouteDistinguisher with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

LibreNMS before 26.5.0 contains stored cross-site scripting vulnerabilities in VRF display pages where mplsVpnVrfDescription, vrf_name, and mplsVpnVrfRouteDistinguisher fields from SNMP polling are rendered without sanitization. Attackers controlling a monitored network device can inject arbitrary JavaScript through SNMP responses that executes in the browser of any user viewing VRF-related pages.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-84191 since 09/01/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 26.5.0 eliminates this vulnerability.

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Productinfo

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Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.1
CNA Vector (VulnCheck): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: LibreNMS 26.5.0

Timelineinfo

09/01/2026 Advisory disclosed
09/01/2026 +0 days CVE reserved
09/01/2026 +0 days VulDB entry created
09/01/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-84191 (🔒)
GCVE (CVE): GCVE-0-2026-84191
GCVE (VulDB): GCVE-100-397590

Entryinfo

Created: 09/01/2026 14:01
Changes: 09/01/2026 14:01 (76)
Complete: 🔍
Cache ID: 216::103

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