A reflected cross-site scripting (XSS) vulnerability in the Community Edition version 9.0 of OS4ED's openSIS Classic allows remote attackers to execute arbitrary JavaScript in the web browser of a user, by including a malicious payload into any of the 'calendar_id', 'school_date', 'month' or 'year' parameters in 'CalendarModal.php'.
https://github.com/dub-flow/vulnerability-research/tree/main/CVE-2023-38881