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Alta

LibreNMS Vulnerable to Remote Code Execution by Signal Alert Transportation module

  • Publicada: 18.08.2026
  • Actualizado: 11.10.2026 10:22

Summary

A vulnerability has been identified that allows an authenticated administrator to execute arbitrary code on the host server. By adding an alert transport entry, an attacker with administrative privileges can execute malicious commands.

Details

The vulnerability is caused by an unsafe exec call in deliverAlert function of LibreNMS/Alert/Transport/Signal.php. Escapes for the path of signal-cli and the Recipient field are insufficient to prevent command-line injection.

The composer_wrapper.php under scripts is also vulnerable to command injection (unsafe exec calls) by passing the injected command as an argument, and it is accepting arguments passed by deliverAlert.

By chaining these unsafe exec calls, malicious admin user can execute any executables in the server's filesystem.

PoC

  1. Under Dashboard -> Alert -> Alert Transports
<img width="282" height="273" alt="image" src="https://github.com/user-attachments/assets/b72f55b0-b782-47d0-b4f7-75f498019345" />
  1. Create a new Alert Transport entry. a. Select Signal as Transport type. b. Put ../scripts/composer_wrapper.php into Path. c. Put the command to execute under Recipient with ; at the start and the end of string.
<img width="767" height="391" alt="image" src="https://github.com/user-attachments/assets/5e34bfa8-4bd5-40cb-9624-0d40e40ccdc5" />
  1. . Click Save Transport, and after the popup closed, click Test Transport button under Action of the created Alert Transport entry.
<img width="172" height="90" alt="image" src="https://github.com/user-attachments/assets/7f83db07-fbf9-4be6-b247-533a6d7b9828" />
  1. The command is executed. <img width="532" height="216" alt="image" src="https://github.com/user-attachments/assets/d595b0fe-10cc-4050-b4b9-d290b658689d" />

Impact

This vulnerability allows a malicious actor to achieve Remote Code Execution (RCE), potentially leading to complete system compromise, data exfiltration, or lateral movement within the network.

Remediation Advice

Escape user inputs, and avoid passing them directly into exec function. (scripts/composer_wrapper.php) Avoid setting executable paths directly in web interface. Instead, use a config value, and only allow setting executable paths by command line interface. (LibreNMS/Alert/Transport/Signal.php)

Software afectado

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PlataformaPaqueteVersiones vulnerablesCorregida en
Paquete de Composer librenms/librenms >= 21.6.0, < 26.5.0 26.5.0

Referencias

Puntuación CVSS -
Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Debilidad (CWE)
CWE-77
Plataforma
Composer
Paquete
librenms/librenms
Publicada
18.08.2026
Actualizado
11.10.2026 10:22

Fuentes y licencias

OSV / GitHub Advisory Database - GHSA-c9fv-cgmm-2wg7 - 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.

Todas (106) en el archivo
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

Gravedad:
  1. LibreNMS — Stored XSS via SNMP/Syslog Data in Legacy Templates
    Alta · 7.1 CVE-2026-84192 < 26.5.0 26.5.0
  2. LibreNMS: SSRF-driven stored XSS via Oxidized API response fields in device showconfig page
    Alta · 8.1 CVE-2026-84189 < 26.7.0 26.7.0
  3. LibreNMS Vulnerable to Remote Code Execution by Signal Alert Transportation module esta entrada
    Alta CVE-2026-55182 >= 21.6.0, < 26.5.0 26.5.0
  4. LibreNMS is Vulnerable to Remote Code Execution by Arbitrary File Write
    Alta CVE-2026-6204 >= 1.48, < 26.3.0 26.3.0
  5. LibreNMS has a Time-Based Blind SQL Injection in address-search.inc.php
    Alta · 8.8 CVE-2026-26990 < 26.2.0 26.2.0
  6. LibreNMS: SQL Injection in ajax_table.php spreads through a covert data stream.
    Alta CVE-2026-26988 < 26.2.0 26.2.0
  7. LibreNMS contains an authenticated SQL Injection vulnerability
    Alta · 7.1 CVE-2020-36947 <= 1.46 sin corrección
  8. LibreNMS has Authenticated Remote File Inclusion in ajax_form.php that Allows RCE
    Alta · 7.5 CVE-2025-54138 < 25.7.0 25.7.0
  9. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/device/services.inc.php
    Alta · 7.5 CVE-2024-52526 < 24.10.0 24.10.0
  10. LibreNMS has an Authenticated OS Command Injection
    Crítica · 9.1 CVE-2024-51092 < 24.10.0 24.10.0
  11. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/print-customoid.php
    Alta · 7.5 CVE-2024-51497 < 24.10.0 24.10.0
  12. LibreNMS has a Reflected XSS ('Cross-site Scripting') in librenms/includes/html/pages/wireless.inc.php
    Alta · 7.5 CVE-2024-51496 < 24.10.0 24.10.0
  13. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/dev-overview-data.inc.php
    Alta · 7.5 CVE-2024-51495 < 24.10.0 24.10.0
  14. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/app/Http/Controllers/Table/EditPortsController.php
    Alta · 7.5 CVE-2024-51494 < 24.10.0 24.10.0
  15. LibreNMS has a Persistent XSS from Insecure Input Sanitization Affects Multiple Endpoints
    Alta · 7.2 CVE-2024-50355 < 24.10.0 24.10.0
  16. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/device/overview/services.inc.php
    Alta · 7.5 CVE-2024-50352 < 24.10.0 24.10.0
  17. LibreNMS has a Reflected XSS ('Cross-site Scripting') in librenms/includes/functions.php
    Alta · 7.5 CVE-2024-50351 < 24.10.0 24.10.0
  18. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/app/Http/Controllers/Table/EditPortsController.php
    Alta · 7.5 CVE-2024-50350 < 24.10.0 24.10.0
  19. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/device/capture.inc.php
    Alta · 7.5 CVE-2024-49764 < 24.10.0 24.10.0
  20. Stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/edituser.inc.php
    Alta · 7.5 CVE-2024-49759 < 24.10.0 24.10.0
  21. LibreNMS has a stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/api-access.inc.php
    Alta · 7.5 CVE-2024-49754 < 24.10.0 24.10.0
  22. LibreNMS has Stored Cross-site Scripting vulnerability in "Device Group" Name
    Alta · 7.2 CVE-2024-47524 < 24.9.0 24.9.0
  23. LibreNMS vulnerable to a Time-Based Blind SQL injection leads to database extraction
    Alta · 7.2 CVE-2024-32480 < 24.4.0 24.4.0
  24. LibreNMS uses Improper Sanitization on Service template name leads to Stored XSS
    Alta · 7.1 CVE-2024-32479 < 24.4.0 24.4.0
  25. LibreNMS vulnerable to SQL injection time-based leads to database extraction
    Alta · 8.8 CVE-2024-32461 < 24.4.0 24.4.0
  26. SQL injection in librenms/librenms
    Alta · 7.8 CVE-2023-5591 < 23.10.0 23.10.0
  27. Cross site scripting in librenms
    Alta · 8.4 CVE-2023-5060 < 23.9.1 23.9.1
  28. LibreNMS Cross-site Scripting vulnerability
    Alta · 7.6 CVE-2023-4347 < 23.8.0 23.8.0
  29. Deserialization of Untrusted Data in librenms/librenms
    Alta · 8.8 CVE-2022-3525 < 22.10.0 22.10.0
  30. Cross-site Scripting in librenms/librenms
    Alta · 7.6 CVE-2022-4068 < 22.10.0 22.10.0
  31. Insufficient Session Expiration in librenms/librenms
    Crítica · 9.8 CVE-2022-4070 < 22.10.0 22.10.0
  32. Command injection in librenms
    Alta CVE-2022-29712 < 22.4.0 22.4.0
  33. LibreNMS Information Disclosure
    Crítica · 9.8 CVE-2019-10665 <= 1.47 sin corrección
  34. LibreNMS arbitrary OS commands execution
    Crítica · 9.8 CVE-2018-20434 = 1.46 sin corrección
  35. LibreNMS SQL Injection
    Alta · 8.8 CVE-2018-20678 < 1.65 1.65
  36. Improper Access Control in librenms
    Alta · 7.1 CVE-2022-0580 < 22.2.0 22.2.0
  37. Improper Authorization in librenms
    Alta · 7.1 CVE-2022-0587 < 22.2.0 22.2.0
  38. Path traversal in librenms/librenms
    Crítica · 9.8 CVE-2021-44278 <= 21.11.0 sin corrección
  39. Exposure of Resource to Wrong Sphere in LibreNMS
    Alta · 8.8 CVE-2020-15877 < 1.65.1 1.65.1
  40. SQL Injection in librenms
    Alta · 8.8 CVE-2020-35700 < 21.1.0 21.1.0
  41. SQL Injection in LibreNMS
    Alta · 8.8 CVE-2019-10671 < 1.50.1 1.50.1
  42. SQL Injection in LibreNMS
    Alta · 8.1 CVE-2019-12465 < 1.53 1.53
  43. Path Traversal in LibreNMS
    Alta · 7.5 CVE-2019-12464 < 1.53 1.53
  44. Improper Encoding or Escaping of Output and Injection in LibreNMS
    Alta · 8.8 CVE-2019-12463 >= 1.50.1, < 1.53 1.53

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