---
id: CVE-2026-91107
title: >-
  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.
summary: >-
  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.
severity: critical
cvss: 9.3
cvssVector: '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'
cwe:
  - CWE-639
vendor: OS4ED
product: openSIS-Classic
affected:
  - openSIS-Classic 9.3
published: '2026-10-05'
updated: '2026-10-05'
sourceUpdated: '2026-10-05T22:16:58.657'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91107'
references:
  - url: 'https://fluidattacks.com/advisories/hearts'
    label: help@fluidattacks.com
  - url: 'https://github.com/OS4ED/openSIS-Classic'
    label: help@fluidattacks.com
  - url: >-
      https://github.com/OS4ED/openSIS-Classic/commit/24bb530391a67c114cd4fe3dff65da7e070f5ed1
    label: help@fluidattacks.com
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-05T21:34:25.120Z'
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.