CVE-2025-59110 is a medium-severity CSRF vulnerability identified in Windu CMS version 4.1. The vulnerability resides in the user editing functionality where the CMS's CSRF protection mechanism can be bypassed by reusing a CSRF token belonging to another user. This bypass undermines the integrity of the CSRF defense, allowing an attacker who has registered an account on the CMS (registration is open to anyone) to perform unauthorized actions on behalf of other users. The attack vector requires no prior authentication beyond creating an account and involves user interaction, such as tricking a victim into visiting a malicious link or page. The vendor was notified early but has not disclosed detailed information or released patches, and other versions of Windu CMS have not been tested but may also be vulnerable. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required, but user interaction is necessary, with high impact on integrity but no impact on confidentiality or availability. This vulnerability could allow attackers to modify user data or settings, potentially leading to privilege escalation or account takeover scenarios if combined with other weaknesses. No known exploits have been reported in the wild, but the open registration feature increases the attack surface. The vulnerability highlights the importance of robust CSRF token management and validation tied to user sessions.

For European organizations using Windu CMS 4.1, this vulnerability poses a risk of unauthorized user data modification and potential privilege escalation. Since the CMS allows open registration, attackers can easily create accounts to exploit the CSRF token reuse flaw, potentially compromising user accounts or administrative functions if user editing includes sensitive operations. This could lead to data integrity issues, unauthorized changes to website content or user permissions, and reputational damage. Organizations relying on Windu CMS for public-facing websites or intranet portals with multiple user roles are particularly at risk. The lack of vendor response and patches increases the window of exposure. While no direct confidentiality or availability impact is noted, the integrity compromise could facilitate further attacks or unauthorized access, especially in environments where user roles are critical. European entities with compliance obligations around data integrity and user access controls should prioritize addressing this issue to avoid regulatory and operational risks.

1. Immediately restrict or disable open user registration on Windu CMS installations to limit attacker account creation. 2. Implement additional CSRF protections such as double-submit cookies or SameSite cookie attributes to strengthen token validation. 3. Enforce strict session management ensuring CSRF tokens are uniquely tied to user sessions and cannot be reused across accounts. 4. Monitor user editing activities and audit logs for suspicious or unauthorized changes. 5. If possible, upgrade to a newer, patched version of Windu CMS once available or consider alternative CMS platforms with active security support. 6. Employ web application firewalls (WAF) with custom rules to detect and block anomalous CSRF attack patterns. 7. Educate users and administrators about phishing and social engineering risks related to CSRF attacks. 8. Conduct regular security assessments and penetration tests focusing on user management and CSRF protections. 9. Isolate critical administrative interfaces behind VPNs or IP whitelisting to reduce exposure. 10. Engage with the vendor or community to obtain updates or patches and share threat intelligence.