LibreNMS has a Stored XSS vulnerability in its Alert Transport name field
Summary
LibreNMS <= 25.8.0 contains a Stored Cross-Site Scripting (XSS) vulnerability in the Alert Transports management functionality. When an administrator creates a new Alert Transport, the value of the Transport name field is stored and later rendered in the Transports column of the Alert Rules page without proper input validation or output encoding. This leads to arbitrary JavaScript execution in the admin’s browser.
Details
- Injection point:
Transport namefield in/alert-transports. - Execution point: Transports column in
/alert-rules. - Scope: Only administrators can create Alert Transports, and only administrators can view the affected Alert Rules page. Therefore, both exploitation and impact are limited to admin users.
Steps to reproduce
-
Log in with an administrator account.
-
Navigate to:
http://localhost:8000/alert-transports -
Click Create alert transport and provide the following values:
-
Transport name:
html'onfocus='alert(1)' autofocus= -
Default Alert:
ON -
Email:
test@gmail.com(or any valid email)
Save the transport.
-
-
Navigate to
http://localhost:8000/alert-rules. A popupalert(1)is triggered, confirming that the payload executes. <img width="1829" height="396" alt="image" src="https://github.com/user-attachments/assets/932ba17d-214d-4253-80b8-62539d1cfa28" />
Impact
Only accounts with the admin role who access the Alert Rules page (http://localhost:8000/alert-rules) are affected.
Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de Composer | librenms/librenms | < 25.10.0 | 25.10.0 |
Referencias
- https://github.com/librenms/librenms/security/advisories/GHSA-frc6-pwgr-c28w
- https://nvd.nist.gov/vuln/detail/CVE-2025-62411
- https://github.com/librenms/librenms/commit/706a77085f4d5964f7de9444208ef707e1f79450
- https://github.com/librenms/librenms/commit/e1ead366239b57e88f9a06d4f7c213b1e2530cd8
- https://github.com/librenms/librenms
- https://github.com/librenms/librenms/releases/tag/25.10.0
- Vector CVSS
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N- Debilidad (CWE)
CWE-79- Plataforma
- Composer
- Paquete
librenms/librenms- Publicada
- 16.10.2025
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-frc6-pwgr-c28w - CC BY 4.0
Historial de vulnerabilidades: librenms/librenms
Todas las vulnerabilidades publicadas de este paquete (Paquete de Composer), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 106
- Primera → última
- 10.2019 08.2026
- Sin corrección
- 6
- Explotada en ataques
- 0
Distribución por gravedad
- Crítica 5
- Alta 39
- Media 56
- Baja 6
Divulgaciones por año
- 2019: 6
- 2020: 0
- 2021: 7
- 2022: 26
- 2023: 12
- 2024: 24
- 2025: 15
- 2026: 16
-
LibreNMS has a Stored XSS vulnerability in its Alert Transport name field esta entrada
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