CVE-2025-59115 identifies a stored Cross-Site Scripting (XSS) vulnerability in Windu CMS version 4.1, a content management system developed by JCD. The vulnerability arises from improper neutralization of input during web page generation, specifically on the logon page where user-supplied input is not properly validated or sanitized. An attacker can exploit this by injecting arbitrary HTML and JavaScript code into the logon page input fields. This malicious payload is stored persistently and executed when an administrator or authorized user accesses the logs page, which renders the injected content. The execution of arbitrary scripts in the context of the administrator’s browser session can lead to session hijacking, credential theft, or unauthorized actions within the CMS. The vulnerability does not require any privileges or authentication to exploit, but it does require the victim to interact by visiting the logs page. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required, user interaction needed, and limited scope impact. The vendor was notified early but has not released patches or detailed affected version ranges beyond confirming version 4.1 as vulnerable. No known exploits are currently reported in the wild, but the risk remains due to the nature of stored XSS and the potential impact on administrative users.

For European organizations, the impact of this vulnerability can be significant, especially for those relying on Windu CMS for managing websites or internal portals. Successful exploitation can lead to administrative account compromise, allowing attackers to manipulate website content, steal sensitive data, or pivot to further internal network attacks. The stored XSS nature means that any user with access to the logs page could be targeted, increasing the risk of widespread compromise if multiple administrators access the vulnerable interface. This could affect confidentiality by exposing sensitive administrative data, integrity by allowing unauthorized content changes, and availability if attackers disrupt CMS operations. Organizations in sectors such as government, finance, healthcare, and critical infrastructure that use Windu CMS are particularly at risk due to the potential for high-impact consequences. The lack of vendor patches increases the urgency for organizations to implement compensating controls.

1. Restrict access to the logs page to only trusted administrative IP addresses or VPN users to reduce exposure. 2. Implement web application firewall (WAF) rules to detect and block common XSS payloads targeting the logon and logs pages. 3. Apply strict input validation and output encoding on all user-supplied data fields, especially on the logon page, to neutralize malicious scripts. 4. Monitor logs and CMS activity for unusual behavior indicative of exploitation attempts or successful attacks. 5. If possible, upgrade to a newer, patched version of Windu CMS once available or consider alternative CMS platforms with active security support. 6. Educate administrators to avoid clicking suspicious links and to report anomalies promptly. 7. Conduct regular security assessments and penetration tests focusing on CMS components. 8. Isolate the CMS environment from critical internal networks to limit lateral movement in case of compromise.