CVE-2025-12918 identifies a vulnerability in the yungifez Skuul School Management System, specifically affecting versions 2.6.0 through 2.6.5. The issue resides in the /dashboard/fees/fee-invoices/ component, within an unspecified function responsible for viewing fee invoices. The vulnerability arises from improper control of resource identifiers, where the invoice_id argument can be manipulated by an attacker. This manipulation can lead to unauthorized access or modification of fee invoice data, potentially exposing sensitive financial information or allowing unauthorized actions on fee records. The attack vector is remote network access, requiring low privileges but no user interaction, and the attack complexity is high, indicating that exploitation demands significant skill or specific conditions. The CVSS 4.0 score is 2.3, reflecting low severity due to limited impact on confidentiality, integrity, and availability, and the absence of privilege escalation or user interaction requirements. Despite the vendor being notified early, no response or patch has been issued, and an exploit has been publicly disclosed, increasing the risk of exploitation. However, no active exploitation in the wild has been reported to date.

For European organizations, particularly educational institutions using the yungifez Skuul School Management System, this vulnerability could lead to unauthorized disclosure or manipulation of student fee invoices and related financial data. While the low CVSS score suggests limited impact, exposure of financial records can undermine privacy compliance obligations under GDPR and damage institutional trust. The inability to control resource identifiers properly may also allow attackers to view or alter invoices not assigned to them, potentially causing billing errors or financial discrepancies. Given the high complexity and low exploitability, widespread attacks are unlikely, but targeted attacks against specific schools or districts could occur. The lack of vendor response and patches increases the risk that organizations remain vulnerable for extended periods, especially if exploit code is leveraged by skilled attackers. The impact on availability and integrity is minimal, but confidentiality concerns and administrative disruption remain relevant.

Organizations should immediately audit their deployment of the yungifez Skuul School Management System to identify affected versions (2.6.0 to 2.6.5). In absence of official patches, administrators should implement strict access controls and input validation on the invoice_id parameter at the web application firewall or reverse proxy level to prevent unauthorized manipulation. Monitoring and logging of access to fee invoice endpoints should be enhanced to detect anomalous requests or patterns indicative of exploitation attempts. Network segmentation can limit exposure of the management system to trusted internal users only. Additionally, organizations should consider temporary disabling or restricting access to the fee invoice viewing functionality if feasible until a vendor patch is released. Engaging with the vendor or community to encourage patch development is recommended. Finally, regular security awareness training for administrators on monitoring and incident response can improve readiness against potential exploitation.