Overview
A significant security vulnerability, identified as CVE-2025-34266, has been discovered in Advantech WISE-DeviceOn Server versions prior to 5.4. This vulnerability is a stored cross-site scripting (XSS) issue that allows attackers to inject malicious scripts into the application. Successful exploitation could lead to session compromise and unauthorized actions.
Technical Details
The vulnerability resides in the /rmm/v1/plugin-config/addins/menus endpoint. An authenticated user with the ability to add or edit AddIns menu entries can inject malicious JavaScript code into the ‘label’ or ‘path’ fields of the AddIns menu configuration. These values are then stored and rendered in the AddIns UI without proper HTML sanitization. When other users view or interact with the affected AddIns entry, the injected script is executed within their browser context.
This lack of input validation makes it possible for an attacker to perform actions such as stealing cookies, redirecting users to phishing sites, or modifying the content of the web page, all within the security context of the victim’s session.
CVSS Analysis
Currently, the CVSS score for CVE-2025-34266 is not available (N/A). However, given the nature of stored XSS vulnerabilities, the potential impact is considered high. Awaiting the official CVSS score from NVD or other vulnerability scoring systems is recommended for a more precise assessment.
Possible Impact
The exploitation of this XSS vulnerability can have severe consequences:
- Session Hijacking: Attackers can steal user session cookies and impersonate legitimate users.
- Account Takeover: By gaining access to user sessions, attackers can potentially take over user accounts and perform unauthorized actions.
- Data Theft: Malicious scripts can be used to steal sensitive data displayed on the web page.
- Malware Distribution: Attackers could redirect users to malicious websites or inject malware into the application.
- Defacement: The application’s interface can be defaced to spread misinformation or cause reputational damage.
Mitigation and Patch Steps
Advantech has released a patch to address this vulnerability. It is highly recommended that users of Advantech WISE-DeviceOn Server upgrade to version 5.4 or later as soon as possible.
Here are the recommended mitigation steps:
- Upgrade to Version 5.4 or Later: The most effective way to mitigate this vulnerability is to upgrade your Advantech WISE-DeviceOn Server to the latest version, which includes the necessary security fixes.
- Input Validation: If upgrading immediately is not possible, implement strict input validation and sanitization on the ‘label’ and ‘path’ fields in the AddIns menu configuration. Use appropriate encoding techniques to prevent the execution of malicious scripts. This is a temporary measure and should not replace upgrading.
- Web Application Firewall (WAF): Consider deploying a Web Application Firewall (WAF) to detect and block XSS attacks targeting the vulnerable endpoint. However, a WAF is not a substitute for patching the underlying vulnerability.
