What’s Vulnerable › Vulnerabilities

CVE-2021-41691

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-06-24 · updated 2026-06-17
• Weakness: CWE-89

Description

A SQL injection vulnerability exists in OS4Ed Open Source Information System Community v8.0 via the "student_id" and "TRANSFER{SCHOOL]" parameters in POST request sent to /TransferredOutModal.php.

Affected products

• OS4ED openSIS-Classic: 8.0

References

• https://github.com/OS4ED/openSIS-Classic/
• https://opensis.com/
• https://resources.s4e.io/blog/opensis-student-information-system-0-day-vulnerability-cve-2021-41691/

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