CVE-2026-91107

openSIS Classic 9.3 - Insecure Direct Object Reference (IDOR)

Published Oct 5, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title openSIS Classic 9.3 - Insecure Direct Object Reference (IDOR)
First Time appeared Os4ed
Os4ed opensis-classic
Weaknesses CWE-639
CPEs cpe:2.3:a:os4ed:opensis-classic:9.3:*:linux:*:*:*:*:*
cpe:2.3:a:os4ed:opensis-classic:9.3:*:macos:*:*:*:*:*
cpe:2.3:a:os4ed:opensis-classic:9.3:*:windows:*:*:*:*:*
Vendors & Products Os4ed
Os4ed opensis-classic
References
Metrics cvssV4_0

{'score': 9.3, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Fluid Attacks
Published
Updated
Oct 6, 2026, 1:54 PM
Reserved
Sep 14, 2026, 7:25 PM
Status
Awaiting Analysis
Published
Oct 5, 2026, 10:16 PM
Modified
Oct 6, 2026, 3:08 PM