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CVE-2026-77759

High

Description

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.

SeverityHigh
CVSS8.7
Exploit probability—
ProductProspero Flow CRM
PublishedAug 21, 2026
First seenAug 21, 2026
Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update
  • Roskus Prospero Flow CRM5.3.6 or later
Patches
Vendor advisories

Affected products

ProductAffected versionsFixed in
Roskus Prospero Flow CRM5.0.0 ≤ v < 5.3.65.3.6

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