CVE-2021-39377: OS4ED Opensis

Critical severity, CVSS 9.8. EPSS: 3.6% chance of exploitation in the next 30 days.

A SQL Injection vulnerability exists in openSIS 8.0 when MySQL (MariaDB) is being used as the application database. A malicious attacker can issue SQL commands to the MySQL (MariaDB) database through the index.php username parameter.

Affected products

• OS4ED Opensis: version 8.0 only

Published 2021-09-01. Last modified 2026-06-17.