GHSA-vxq6-8cwm-wj99

Suggest an improvement
Source
https://github.com/advisories/GHSA-vxq6-8cwm-wj99
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-vxq6-8cwm-wj99/GHSA-vxq6-8cwm-wj99.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-vxq6-8cwm-wj99
Aliases
Published
2025-08-18T22:25:29Z
Modified
2025-08-18T23:12:15Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N CVSS Calculator
Summary
LibreNMS allows stored XSS in Alert Template name field
Details

Summary

A stored Cross-Site Scripting (XSS) vulnerability exists in LibreNMS (<= 25.6.0) in the Alert Template creation feature. This allows a user with the admin role to inject malicious JavaScript, which will be executed when the template is rendered, potentially compromising other admin accounts.

Details

In the LibreNMS web UI, when a user with the admin role visits /templates and clicks "Create new alert template", the "Template name" field fails to properly sanitize input. By inserting a payload like:

&lt;script>alert(document.cookie)&lt;/script>

and filling the other fields with arbitrary content (e.g., test), once the template is saved, the script is executed. This confirms that user input is stored and later rendered without proper output encoding.

This vulnerability can be exploited for session hijacking, data theft, or other malicious actions targeting other admin users.

PoC

  1. Log in to LibreNMS using an account with the admin role.

  2. Navigate to: http://localhost:8000/templates.

  3. Click the "Create new alert template" button.

  4. Input the following into the Template name field:

    &lt;script>alert(document.cookie)&lt;/script>

  5. Fill the remaining fields (Template, Alert title, Recovery title) with arbitrary content such as test.

  6. Click "Create template".

  7. Upon saving, a JavaScript alert pops up, confirming the stored XSS is triggered. image

Impact

Type: Stored Cross-Site Scripting (XSS) Affected users: Only accounts with the admin role who access the Alert Templates page (http://localhost:8000/templates) are affected. Attackers need: Authenticated admin-level access.

Database specific 
{
    "cwe_ids":  [
        "CWE-79"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2025-08-18T22:25:29Z",
    "nvd_published_at":  "2025-08-18T18:15:39Z",
    "severity":  "MODERATE"
}
References

Affected packages

Packagist / librenms/librenms

Package

Name
librenms/librenms
Purl
pkg:composer/librenms/librenms

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
25.8.0

Affected versions

1.*
1.19
1.20
1.20.1
1.21
1.22
1.22.01
1.23
1.24
1.25
1.26
1.27
1.28
1.29
1.30
1.30.01
1.31
1.31.01
1.31.02
1.31.03
1.32
1.32.01
1.33
1.33.01
1.34
1.35
1.36
1.36.01
1.37
1.38
1.39
1.40
1.41
1.42
1.42.01
1.43
1.44
1.45
1.46
1.47
1.48
1.48.1
1.49
1.50
1.50.1
1.51
1.52
1.53
1.53.1
1.54
1.55
1.56
1.57
1.58
1.58.1
1.59
1.60
1.61
1.62
1.62.1
1.62.2
1.63
1.64
1.64.1
1.65
1.65.1
1.66
1.67
1.68
1.69
1.70.0
1.70.1
21.*
21.1.0
21.2.0
21.3.0
21.4.0
21.5.0
21.5.1
21.6.0
21.7.0
21.8.0
21.9.0
21.9.1
21.10.0
21.10.1
21.10.2
21.11.0
21.12.0
21.12.1
22.*
22.1.0
22.2.0
22.2.1
22.2.2
22.3.0
22.4.0
22.4.1
22.5.0
22.6.0
22.7.0
22.8.0
22.9.0
22.10.0
22.11.0
22.12.0
23.*
23.1.0
23.1.1
23.2.0
23.4.0
23.4.1
23.5.0
23.6.0
23.7.0
23.8.0
23.8.1
23.8.2
23.9.0
23.9.1
23.10.0
23.11.0
24.*
24.1.0
24.2.0
24.3.0
24.4.0
24.4.1
24.5.0
24.6.0
24.7.0
24.8.0
24.8.1
24.9.0
24.9.1
24.10.0
24.10.1
24.11.0
24.12.0
25.*
25.1.0
25.2.0
25.3.0
25.4.0
25.5.0
25.6.0
25.7.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/08/GHSA-vxq6-8cwm-wj99/GHSA-vxq6-8cwm-wj99.json"