CVE-2026-77759: Roskus Prospero Flow CRM

High severity, CVSS 8.7. EPSS: 0.5% chance of exploitation in the next 30 days.

Authorization Bypass Through User-Controlled Key in the transaction API in Roskus Prospero Flow CRM 5.0.0 through 5.3.5 allows an authenticated user to read the transactions of other companies on the same instance via an incremented identifier in GET /api/transaction/{id}, which is resolved without company scoping and without any permission check.

Affected products

• Roskus Prospero Flow CRM: from 5.0.0, before 5.3.6 (fixed in 5.3.6)

Published 2026-08-21. Last modified 2026-09-01.