---
id: CVE-2026-77759
title: >-
  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 iden…
summary: >-
  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 iden…
severity: none
cwe:
  - CWE-639
published: '2026-08-21'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T19:10:00.173'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77759'
references:
  - url: >-
      https://github.com/Roskus/prospero-flow-crm/commit/980c35ac00e419591a8adc2d1dbcc120ea62e273
    label: 4daa8cea-433a-44bd-9456-53b127fc289a
  - url: 'https://github.com/Roskus/prospero-flow-crm/releases/tag/v5.5.3'
    label: 4daa8cea-433a-44bd-9456-53b127fc289a
  - url: >-
      https://secur0.com/en/cna/cve-list/cve-2026-77759-idor-missing-authz-prospero-transaction-api
    label: 4daa8cea-433a-44bd-9456-53b127fc289a
tags:
  - nvd
epss: 0.00509
epssPercentile: 0.42021
ingestedAt: '2026-10-15T19:25:46.349Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.