CVE-2021-40353: OS4ED Opensis

Critical severity, CVSS 9.8. EPSS: 2.9% chance of exploitation in the next 30 days.

A SQL injection vulnerability exists in version 8.0 of openSIS when MySQL or MariaDB is used as the application database. An attacker can then issue the SQL command through the index.php USERNAME parameter. NOTE: this issue may exist because of an incomplete fix for CVE-2020-6637.

Affected products

• OS4ED Opensis: version 8.0 only

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