What’s Vulnerable › Vulnerabilities

CVE-2026-91107: openSIS Classic 9.3 - Insecure Direct Object Reference (IDOR)

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-05 · updated 2026-10-06
• Weakness: CWE-639

Description

openSIS Classic 9.3 allows an authenticated user with the built-in teacher role can select an arbitrary staff record through staff_id and cause the School Information update path to reset that selected account's password.

Affected products

• OS4ED openSIS-Classic: 9.3

References

• https://fluidattacks.com/advisories/hearts
• https://github.com/OS4ED/openSIS-Classic
• https://github.com/OS4ED/openSIS-Classic/commit/24bb530391a67c114cd4fe3dff65da7e070f5ed1

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