A security flaw has been discovered in yungifez Skuul School Management System up to 2.6.5. The impacted element is an unknown function of the file /dashboard/fees/fee-invoices/ of the component View Fee Invoice. Performing manipulation of the argument invoice_id results in improper control of resource identifiers. Remote exploitation of the attack is possible. The attack is considered to have high complexity. The exploitability is regarded as difficult. The exploit has been released to the public and may be exploited. The vendor was contacted early about this disclosure but did not respond in any way.