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Medium

LibreNMS has a Stored XSS vulnerability in its Alert Transport name field

  • Disclosed: 16.10.2025
  • Updated: 11.10.2026 10:22

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 name field 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

  1. Log in with an administrator account.

  2. Navigate to:

    http://localhost:8000/alert-transports

  3. 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.

  4. Navigate to http://localhost:8000/alert-rules. A popup alert(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.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package librenms/librenms < 25.10.0 25.10.0

References

CVSS score 5.5/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
Weakness (CWE)
CWE-79
Platform
Composer
Package
librenms/librenms
Disclosed
16.10.2025
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-frc6-pwgr-c28w - CC BY 4.0

Vulnerability history: librenms/librenms

All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (106) in the archive
Total entries
106
First → latest
10.2019 08.2026
Without a fix
6
Exploited in attacks
0

Severity breakdown

  • Critical 5
  • High 39
  • Medium 56
  • Low 6

Disclosures per year

Severity:
  1. LibreNMS — Stored XSS via SNMP/Syslog Data in Legacy Templates
    High · 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
    High · 8.1 CVE-2026-84189 < 26.7.0 26.7.0
  3. LibreNMS Vulnerable to Remote Code Execution by Signal Alert Transportation module
    High CVE-2026-55182 >= 21.6.0, < 26.5.0 26.5.0
  4. LibreNMS is Vulnerable to Remote Code Execution by Arbitrary File Write
    High 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
    High · 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.
    High CVE-2026-26988 < 26.2.0 26.2.0
  7. LibreNMS contains an authenticated SQL Injection vulnerability
    High · 7.1 CVE-2020-36947 <= 1.46 no fix
  8. LibreNMS has a Stored XSS vulnerability in its Alert Transport name field this entry
    Medium · 5.5 CVE-2025-62411 < 25.10.0 25.10.0
  9. LibreNMS has Authenticated Remote File Inclusion in ajax_form.php that Allows RCE
    High · 7.5 CVE-2025-54138 < 25.7.0 25.7.0
  10. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/device/services.inc.php
    High · 7.5 CVE-2024-52526 < 24.10.0 24.10.0
  11. LibreNMS has an Authenticated OS Command Injection
    Critical · 9.1 CVE-2024-51092 < 24.10.0 24.10.0
  12. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/print-customoid.php
    High · 7.5 CVE-2024-51497 < 24.10.0 24.10.0
  13. LibreNMS has a Reflected XSS ('Cross-site Scripting') in librenms/includes/html/pages/wireless.inc.php
    High · 7.5 CVE-2024-51496 < 24.10.0 24.10.0
  14. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/dev-overview-data.inc.php
    High · 7.5 CVE-2024-51495 < 24.10.0 24.10.0
  15. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/app/Http/Controllers/Table/EditPortsController.php
    High · 7.5 CVE-2024-51494 < 24.10.0 24.10.0
  16. LibreNMS has a Persistent XSS from Insecure Input Sanitization Affects Multiple Endpoints
    High · 7.2 CVE-2024-50355 < 24.10.0 24.10.0
  17. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/device/overview/services.inc.php
    High · 7.5 CVE-2024-50352 < 24.10.0 24.10.0
  18. LibreNMS has a Reflected XSS ('Cross-site Scripting') in librenms/includes/functions.php
    High · 7.5 CVE-2024-50351 < 24.10.0 24.10.0
  19. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/app/Http/Controllers/Table/EditPortsController.php
    High · 7.5 CVE-2024-50350 < 24.10.0 24.10.0
  20. LibreNMS has a Stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/device/capture.inc.php
    High · 7.5 CVE-2024-49764 < 24.10.0 24.10.0
  21. Stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/edituser.inc.php
    High · 7.5 CVE-2024-49759 < 24.10.0 24.10.0
  22. LibreNMS has a stored XSS ('Cross-site Scripting') in librenms/includes/html/pages/api-access.inc.php
    High · 7.5 CVE-2024-49754 < 24.10.0 24.10.0
  23. LibreNMS has Stored Cross-site Scripting vulnerability in "Device Group" Name
    High · 7.2 CVE-2024-47524 < 24.9.0 24.9.0
  24. LibreNMS vulnerable to a Time-Based Blind SQL injection leads to database extraction
    High · 7.2 CVE-2024-32480 < 24.4.0 24.4.0
  25. LibreNMS uses Improper Sanitization on Service template name leads to Stored XSS
    High · 7.1 CVE-2024-32479 < 24.4.0 24.4.0
  26. LibreNMS vulnerable to SQL injection time-based leads to database extraction
    High · 8.8 CVE-2024-32461 < 24.4.0 24.4.0
  27. SQL injection in librenms/librenms
    High · 7.8 CVE-2023-5591 < 23.10.0 23.10.0
  28. Cross site scripting in librenms
    High · 8.4 CVE-2023-5060 < 23.9.1 23.9.1
  29. LibreNMS Cross-site Scripting vulnerability
    High · 7.6 CVE-2023-4347 < 23.8.0 23.8.0
  30. Deserialization of Untrusted Data in librenms/librenms
    High · 8.8 CVE-2022-3525 < 22.10.0 22.10.0
  31. Cross-site Scripting in librenms/librenms
    High · 7.6 CVE-2022-4068 < 22.10.0 22.10.0
  32. Insufficient Session Expiration in librenms/librenms
    Critical · 9.8 CVE-2022-4070 < 22.10.0 22.10.0
  33. Command injection in librenms
    High CVE-2022-29712 < 22.4.0 22.4.0
  34. LibreNMS Information Disclosure
    Critical · 9.8 CVE-2019-10665 <= 1.47 no fix
  35. LibreNMS arbitrary OS commands execution
    Critical · 9.8 CVE-2018-20434 = 1.46 no fix
  36. LibreNMS SQL Injection
    High · 8.8 CVE-2018-20678 < 1.65 1.65
  37. Improper Access Control in librenms
    High · 7.1 CVE-2022-0580 < 22.2.0 22.2.0
  38. Improper Authorization in librenms
    High · 7.1 CVE-2022-0587 < 22.2.0 22.2.0
  39. Path traversal in librenms/librenms
    Critical · 9.8 CVE-2021-44278 <= 21.11.0 no fix
  40. Exposure of Resource to Wrong Sphere in LibreNMS
    High · 8.8 CVE-2020-15877 < 1.65.1 1.65.1
Show more (5) Showing 40 of 45

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