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TI-2026-54153 Aliases CVE-2026-77759GHSA-cw49-mhmj-m3xc

IDOR and missing authorization in the Prospero Flow CRM transaction API allow cross-tenant reading of financial records

Priority MEDIUM 44CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

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 identifier in GET /api/transaction/{id}, which is resolved without company scoping and without any permission check.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00509 43rd percentileScored 2026-11-07
Fix Fixed Prospero Flow CRM (Roskus): 5.3.6

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
RoskusProspero Flow CRM5.0.0 to before 5.3.65.3.6Patch availableCNA
  • Prospero Flow CRM VendorRoskus Affected 5.0.0 to before 5.3.6 Fixed in 5.3.6 Patch available CNA

Remediation

  • Fix · CNA Prospero Flow CRM (Roskus) Fixed in 5.3.6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-77759
  2. 2026-10-03 Alias added: GHSA-cw49-mhmj-m3xc

References

Patch 1

Advisory 1

Other 1

  • TI-2026-54500 IDOR and missing authorization in Prospero Flow CRM supplier API allows cross-tenant read and modification CVSS 4.0CRITICAL 9.3
  • TI-2026-16110 Use of hard-coded credentials in Prospero Flow CRM employee onboarding CVSS 4.0CRITICAL 9.3
  • TI-2026-42380 Stored XSS in Prospero Flow CRM email body allows administrator account takeover CVSS 4.0HIGH 8.6
  • TI-2026-42376 Missing authorization in Prospero Flow CRM allows low-privileged users to read all bank accounts CVSS 4.0HIGH 8.7
  • TI-2026-42374 Missing Authorization in Prospero Flow CRM permission save endpoint allows privilege escalation CVSS 4.0HIGH 8.7
  • TI-2026-16008 IDOR in Prospero Flow CRM allows cross-tenant product disclosure and hijacking CVSS 4.0HIGH 8.6
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences