CVE-2025-59117 identifies multiple stored Cross-Site Scripting (XSS) vulnerabilities in Windu CMS, specifically in the page editing endpoint located at windu/admin/content/pages/edit/. The vulnerability stems from improper neutralization of input during web page generation, allowing malicious scripts to be stored and executed when other users access the affected pages. Exploitation requires a privileged user to inject the malicious payload, which can then target users with higher privileges, potentially leading to session hijacking, privilege escalation, or unauthorized actions within the CMS. The vendor was notified early but has not disclosed the full range of affected versions beyond confirming version 4.1 as vulnerable. The CVSS 4.0 base score is 4.8, reflecting medium severity, with an attack vector of network, low attack complexity, no privileges required for the victim, but privileges required for the attacker, and user interaction needed. The vulnerability does not affect confidentiality, integrity, or availability directly but poses a risk to user session security and trustworthiness of content. No known public exploits exist, and no patches have been released at the time of publication. Organizations using Windu CMS 4.1 should be aware of this vulnerability and consider mitigating controls until a patch is available.

For European organizations using Windu CMS version 4.1, this vulnerability can lead to unauthorized script execution within the CMS environment, potentially compromising administrative sessions or enabling privilege escalation attacks. While the direct impact on confidentiality, integrity, and availability is limited, the exploitation of stored XSS can facilitate phishing, session hijacking, or unauthorized actions performed under the guise of legitimate users. This is particularly concerning for organizations managing sensitive content or critical web infrastructure through Windu CMS. The requirement for a privileged user to initiate the attack limits the attack surface but does not eliminate risk, especially in environments with multiple administrators or editors. The absence of patches increases exposure time, and the lack of vendor communication may delay remediation efforts. European entities with regulatory obligations around data protection and web security should prioritize addressing this vulnerability to avoid compliance issues and reputational damage.

1. Restrict access to the page editing endpoint to only the most trusted and necessary privileged users, employing the principle of least privilege. 2. Implement strict input validation and output encoding on all user-supplied content within the CMS, particularly in the page editing functionality, to neutralize potentially malicious scripts. 3. Monitor and audit user activities within the CMS to detect unusual behavior or unauthorized content changes. 4. Employ Content Security Policy (CSP) headers to limit the impact of potential XSS attacks by restricting script execution sources. 5. Isolate administrative interfaces from public-facing networks using network segmentation or VPN access controls. 6. Regularly back up CMS content and configurations to enable recovery in case of compromise. 7. Stay informed on vendor updates or community patches and apply them promptly once available. 8. Consider deploying Web Application Firewalls (WAFs) with rules targeting XSS payloads as an interim protective measure. 9. Educate privileged users about the risks of injecting untrusted content and enforce secure content management practices.