LibreNMS Misc Section Stored Cross-site Scripting vulnerability
StoredXSS-LibreNMS-MiscSection
Description:
Stored XSS on the parameter: ajax_form.php -> param: state
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=override-config&device_id=1&attrib=override_icmp_disable&state="><img%20src%20onerror="alert(1)">of 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.
The vulnerability in the line:
$attrib_val = get_dev_attrib($device, $name);within the dynamic_override_config function arises because the value of $attrib_val is retrieved from untrusted data without any sanitization or encoding (at Line 778).
When dynamic_override_config is called, the unescaped $attrib_val is injected directly into the HTML (at misc.inc.php).
Proof of Concept:
- Add a new device through the LibreNMS interface.
- Edit the newly created device and select the Misc section.
- In any of the following fields: "Override default ssh port", "Override default telnet port", "Override default http port" or "Unix agent port", enter the payload:
"><img src onerror="alert(document.cookie)">. - Save the changes.
- Observe that when the page loads, the XSS payload executes, triggering a popup that displays the current cookies.
Impact:
Execution of Malicious Code
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | librenms/librenms | >= 23.9.0, < 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-c66p-64fj-jmc2 - 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 Misc Section Stored Cross-site Scripting vulnerability this entry
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