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GHSA-frc6-pwgr-c28w
No affected components available
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 namefield 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
-
Log in with an administrator account.
-
Navigate to:
http://localhost:8000/alert-transports -
Click Create alert transport and provide the following values:
-
Transport name:
'onfocus='alert(1)' autofocus= -
Default Alert:
ON -
Email:
test@gmail.com(or any valid email)
Save the transport.
-
-
Navigate to
<img width="1829" height="396" alt="image" src="https://github.com/user-attachments/assets/932ba17d-214d-4253-80b8-62539d1cfa28" />http://localhost:8000/alert-rules. A popupalert(1)is triggered, confirming that the payload executes.
Impact
Only accounts with the admin role who access the Alert Rules page (http://localhost:8000/alert-rules) are affected.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs high-level or administrative privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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