CVE-2026-121732 PUBLISHED

RosarioSIS before 12.9 contains an improper authorization vulnerability that allows school-scoped administrators to assign fees and payments to students of other schools via MassAssignFees.php and MassAssignPayments.php. Attackers can substitute foreign student IDs in the student[] POST array of a modfunc=save request to alter other schools' student billing balances, breaking school isolation.

• harunmansor finder
• François Jacquet remediation developer

• Patch Commit
• https://github.com/francoisjacquet/rosariosis
• https://gitlab.com/francoisjacquet/rosariosis/-/issues/376
• https://github.com/francoisjacquet/rosariosis/blob/v12.8.1/modules/Student_Billing/MassAssignFees.php#L15
• https://github.com/francoisjacquet/rosariosis/blob/v12.8.1/modules/Student_Billing/MassAssignPayments.php#L16
• RosarioSIS v12.9 Release Notes
• VulnCheck Advisory: RosarioSIS before 12.9 Improper Authorization via Student Billing Mass Assignment

• Authorization Bypass Through User-Controlled Key CWE