CVE-2026-91107 PUBLISHED

openSIS Classic 9.3 - Insecure Direct Object Reference (IDOR)

Assigner: Fluid Attacks
Reserved: 14.09.2026 Published: 05.10.2026 Updated: 06.10.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	None	Availability	None
Privileges Required	Low
User Interaction	None

CVSS 4.0

Product Status

Vendor	OS4ED
Product	openSIS-Classic
Versions	Default: unaffected Version 9.3 is affected

Credits

Daniel Celis finder

References

Problem Types

CWE-639 Authorization Bypass Through User-Controlled Key CWE

Impacts

CAPEC-122 Privilege Abuse