CVE-2025-63711 identifies a CSRF vulnerability in the SourceCodester Client Database Management System version 1.0. The vulnerability exists in the user deletion functionality, specifically the superadmin_user_delete.php endpoint, which accepts POST requests with a user_id parameter to delete users. This endpoint does not validate the origin of the request nor does it implement anti-CSRF tokens, allowing attackers to exploit the trust of an authenticated administrative user. Because the endpoint also lacks proper authentication and authorization checks, an attacker can craft a malicious webpage that, when visited by an authenticated admin, automatically triggers the deletion of arbitrary user accounts without the admin's knowledge or consent. This attack vector requires the victim to be logged in with administrative privileges and to visit the malicious page, but does not require any further interaction such as clicking buttons. The vulnerability could lead to unauthorized deletion of user accounts, causing disruption in user management, potential denial of service for affected users, and possible loss of data integrity. No patches or fixes are currently linked, and no known exploits have been reported in the wild as of the publication date. The absence of a CVSS score necessitates an independent severity assessment based on the vulnerability's characteristics.

For European organizations, this vulnerability poses a risk primarily to the integrity and availability of user account data within the affected system. Unauthorized deletion of user accounts by attackers can disrupt business operations, especially if critical administrative or client accounts are removed. This could lead to denial of service for legitimate users and complicate incident response and recovery efforts. Organizations relying on SourceCodester Client Database Management System 1.0 or similar web-based client management tools are at risk. The requirement for an authenticated administrative user to visit a malicious page means social engineering or phishing campaigns could be leveraged to exploit this vulnerability. The impact is heightened in sectors where client data management is critical, such as financial services, healthcare, and legal services, which are prevalent across Europe. Additionally, the lack of existing patches or mitigations increases the window of exposure. While no known exploits are active, the vulnerability's simplicity and the absence of protective controls make it a credible threat if weaponized.

To mitigate this vulnerability, organizations should immediately implement anti-CSRF tokens on all sensitive endpoints, particularly those that perform state-changing operations like user deletion. The superadmin_user_delete.php endpoint must enforce strict authentication and authorization checks to ensure only properly authenticated and authorized users can perform deletions. Web application firewalls (WAFs) can be configured to detect and block suspicious POST requests lacking valid CSRF tokens or originating from untrusted sources. Administrators should be trained to recognize phishing attempts and avoid visiting untrusted or suspicious websites while logged into administrative accounts. Regular security audits and code reviews should be conducted to identify and remediate similar vulnerabilities. If possible, upgrading to a patched or newer version of the software should be prioritized once available. Network segmentation and limiting administrative access to trusted environments can further reduce risk. Finally, monitoring and alerting on unusual user deletion activities can help detect exploitation attempts early.