CVE-2026-91107 openSIS Classic 9.3 - Insecure Direct Object Reference (IDOR)
Authenticated teachers can reset passwords for arbitrary staff accounts via IDOR, enabling unauthorized access and privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-91107?
CVE-2026-91107 is a critical missing authorization vulnerability in OS4ED openSIS-Classic, published on 5 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-639
Which versions are affected by CVE-2026-91107?
How do I fix CVE-2026-91107?
No fix has been published for CVE-2026-91107 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-91107 being exploited?
There is no known exploitation of CVE-2026-91107 in the wild and no public exploit code.
Sources
Also known as GHSA-r588-8qfc-26mv.