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Medium

LibreNMS: Stored XSS via graph_descr admin config settings echoed without escaping to all authenticated users

  • Disclosed: 18.08.2026
  • Updated: 11.10.2026 10:22

Summary

The graph_descr.<graphtype> family of settings is echoed verbatim without htmlspecialchars() in includes/html/pages/graphs.inc.php:194. Any admin can store a malicious HTML payload that executes in every authenticated user's browser viewing that graph type.

CVSS

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N — 4.8 Medium

Details

php
// graphs.inc.php:194
echo LibrenmsConfig::get('graph_descr.' . $vars['type']);

PoC

PUT /settings/graph_descr.device_processor
{"value": "<img src=x onerror=\"alert('ADV-15')\">"}

GET /graphs?type=device_processor
→ <img src=x onerror="alert('ADV-15')">

Fix

php
echo htmlspecialchars(LibrenmsConfig::get('graph_descr.' . $vars['type']), ENT_QUOTES, 'UTF-8');

Prerequisite

Admin session to set the config value.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Composer package librenms/librenms < 26.7.0 26.7.0

References

CVSS score 4.8/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE)
CWE-79
Platform
Composer
Package
librenms/librenms
Disclosed
18.08.2026
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-7cj5-v4pp-v632 - 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: Stored XSS via graph_descr admin config settings echoed without escaping to all authenticated users this entry
    Medium · 4.8 CVE-2026-84188 < 26.7.0 26.7.0
  4. LibreNMS Vulnerable to Remote Code Execution by Signal Alert Transportation module
    High CVE-2026-55182 >= 21.6.0, < 26.5.0 26.5.0
  5. LibreNMS is Vulnerable to Remote Code Execution by Arbitrary File Write
    High CVE-2026-6204 >= 1.48, < 26.3.0 26.3.0
  6. 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
  7. LibreNMS: SQL Injection in ajax_table.php spreads through a covert data stream.
    High CVE-2026-26988 < 26.2.0 26.2.0
  8. LibreNMS contains an authenticated SQL Injection vulnerability
    High · 7.1 CVE-2020-36947 <= 1.46 no fix
  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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