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

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/francoisjacquet/rosariosis/commit/a8bb460aacb11661934e6e91fbe0d8158fbc0c4f

## Affected products and versions

- francoisjacquet / RosarioSIS (francoisjacquet/rosariosis): ≥ 0; < 12.9 (affected, custom). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 2.1 (low); 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; source: CNA: VulnCheck

- CVSS 3.1: 2.7 (low); CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N; source: CNA: VulnCheck

- CVSS 4.0: 2.1 (low); 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 2.7 (low); CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-639

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/francoisjacquet/rosariosis/commit/a8bb460aacb11661934e6e91fbe0d8158fbc0c4f (CNA: VulnCheck; patch)

- https://github.com/francoisjacquet/rosariosis (CNA: VulnCheck; product)

- https://gitlab.com/francoisjacquet/rosariosis/-/issues/376 (CNA: VulnCheck; issue-tracking)

- https://github.com/francoisjacquet/rosariosis/blob/v12.8.1/modules/Student_Billing/MassAssignFees.php#L15 (CNA: VulnCheck; technical-description)

- https://github.com/francoisjacquet/rosariosis/blob/v12.8.1/modules/Student_Billing/MassAssignPayments.php#L16 (CNA: VulnCheck; technical-description)

- https://github.com/francoisjacquet/rosariosis/releases/tag/v12.9 (CNA: VulnCheck; release-notes)

- https://www.vulncheck.com/advisories/rosariosis-before-12.9-improper-authorization-via-student-billing-mass-assignment (CNA: VulnCheck; third-party-advisory)

- https://github.com/francoisjacquet/rosariosis (disclosure@vulncheck.com)

- https://github.com/francoisjacquet/rosariosis/blob/v12.8.1/modules/Student_Billing/MassAssignFees.php#L15 (disclosure@vulncheck.com)

- https://github.com/francoisjacquet/rosariosis/blob/v12.8.1/modules/Student_Billing/MassAssignPayments.php#L16 (disclosure@vulncheck.com)

- https://github.com/francoisjacquet/rosariosis/commit/a8bb460aacb11661934e6e91fbe0d8158fbc0c4f (disclosure@vulncheck.com)

- https://github.com/francoisjacquet/rosariosis/releases/tag/v12.9 (disclosure@vulncheck.com)

- https://gitlab.com/francoisjacquet/rosariosis/-/issues/376 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/rosariosis-before-12.9-improper-authorization-via-student-billing-mass-assignment (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-121732; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-121732; retrieved 2026-11-04; source updated 2026-11-03

Revision: ec23c25bc3e039e22d49bb28a7c9f34abefb5d3eca8148b431e03569002480cb

Canonical: https://y2.dev/cve/CVE-2026-121732

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.