---
cve: "CVE-2026-77759"
severity: "HIGH"
cvss: 8.7
epss: "18.7%"
vendor: "Roskus"
kev: false
exploited: false
published: "2026-08-21 12:16:36"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-03T11:00:38+02:00"
---

# CVE-2026-77759

> 8.7 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 980c35ac00e419591a8adc2d1dbcc120ea62e273 (Commit)
- 584f315878b8366244c95fe3cb016b3a63f05db8 (Commit)

## Referenzen

- <https://github.com/Roskus/prospero-flow-crm/commit/980c35ac00e419591a8adc2d1dbcc120ea62e273>
- <https://github.com/Roskus/prospero-flow-crm/releases/tag/v5.5.3>
- <https://secur0.com/en/cna/cve-list/cve-2026-77759-idor-missing-authz-prospero-transaction-api>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-77759) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_