CVE-2026-77759

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

Published Aug 21, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

Vendor Solution

Upgrade to 5.3.6 or later. The fix was not tagged; the first tagged release carrying it is v5.5.3.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title IDOR and missing authorization in the Prospero Flow CRM transaction API allow cross-tenant reading of financial records
First Time appeared Roskus
Roskus prospero Flow Crm
Weaknesses CWE-639
CPEs cpe:2.3:a:roskus:prospero_flow_crm:*:*:*:*:*:*:*:*
Vendors & Products Roskus
Roskus prospero Flow Crm
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Secur0
Published
Updated
Aug 21, 2026, 11:53 AM
Reserved
Aug 21, 2026, 10:08 AM
Status
Deferred
Published
Aug 21, 2026, 12:16 PM
Modified
Oct 15, 2026, 7:10 PM