CVE-2023-38879: OS4ED Opensis

High severity, CVSS 7.5. EPSS: 3.6% chance of exploitation in the next 30 days.

The Community Edition version 9.0 of OS4ED's openSIS Classic allows remote attackers to read arbitrary files via a directory traversal vulnerability in the 'filename' parameter of 'DownloadWindow.php'.

Affected products

• OS4ED Opensis: version 9.0 only

Published 2023-11-20. Last modified 2026-06-17.