CVE-2026-91107: OS4ED Opensis-Classic

Critical severity, CVSS 9.3. EPSS: 0.2% chance of exploitation in the next 30 days.

openSIS Classic 9.3 allows an authenticated user with the built-in teacher role can select an arbitrary staff record through staff_id and cause the School Information update path to reset that selected account's password.

Affected products

• OS4ED Opensis-Classic: version 9.3 only

Published 2026-10-05. Last modified 2026-10-06.