Overview
CVE-2025-59115 identifies a Stored Cross-Site Scripting (XSS) vulnerability within the Windu CMS platform. Specifically, this vulnerability resides within the logon page, where input data lacks proper validation. A malicious actor can exploit this weakness to inject arbitrary HTML and JavaScript code into the website. This injected code is then rendered and executed whenever an administrator visits the logs page, potentially leading to account compromise, data theft, or other malicious activities.
The vendor was notified about this vulnerability but has not yet provided details regarding affected version ranges or a patch. Version 4.1 has been tested and confirmed as vulnerable. Other versions have not been tested and may also be susceptible.
Technical Details
The core of the vulnerability lies in the inadequate sanitization of input received by the login page. An attacker can insert malicious JavaScript or HTML code into a field that is subsequently stored and displayed on the administrator’s logs page. When the administrator accesses this page, the stored malicious code is executed within their browser context. This allows the attacker to perform actions on behalf of the administrator, bypassing security measures and gaining unauthorized access. The lack of input validation on the login page is the key contributing factor.
CVSS Analysis
Due to the vendor’s lack of response and the absence of a formal CVSS score, the severity of this vulnerability is currently classified as N/A. However, based on the potential impact of Stored XSS, a reasonable assessment would likely place it in the Medium to High severity range. Factors contributing to this assessment include:
- Attack Vector: Network
- Attack Complexity: Low
- Privileges Required: None (initial access via login)
- User Interaction: Required (admin visiting logs page)
- Scope: Changed (attacker can potentially gain admin privileges)
- Confidentiality Impact: High
- Integrity Impact: High
- Availability Impact: None/Low (depending on injected code)
A CVSS score would be updated once the vendor provides the appropriate data.
Possible Impact
The successful exploitation of this Stored XSS vulnerability can lead to several severe consequences:
- Administrator Account Compromise: An attacker could steal the administrator’s session cookie or credentials, gaining full control over the Windu CMS instance.
- Website Defacement: Malicious code can alter the appearance and functionality of the website.
- Malware Distribution: Injected JavaScript can redirect users to malicious websites or trigger the download of malware.
- Data Theft: Sensitive information stored within the CMS database could be accessed and exfiltrated.
- Phishing Attacks: The compromised website can be used to host phishing campaigns targeting users.
Mitigation or Patch Steps
Due to the lack of a patch from the vendor, the following mitigation steps are recommended:
- Restrict Access to Logs: Limit access to the logs page to only trusted administrators.
- Input Validation and Sanitization: Implement robust input validation and sanitization on the login page. This includes escaping special characters and filtering potentially malicious code. (If possible, through custom code)
- Content Security Policy (CSP): Implement a strict Content Security Policy to limit the sources from which scripts can be executed. This can help mitigate the impact of injected XSS code.
- Web Application Firewall (WAF): Utilize a Web Application Firewall (WAF) to detect and block XSS attacks.
- Monitor for Suspicious Activity: Regularly monitor website logs for any unusual or suspicious activity that might indicate an attempted or successful XSS attack.
- Consider Alternative CMS: If the lack of vendor response and security updates persists, evaluate migrating to a more secure and actively maintained CMS platform.
