IDOR and missing authorization in the Prospero Flow CRM transaction API allow cross-tenant reading of financial records (CVE-2026-77759) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-77759

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

Answer in brief

CVE-2026-77759 records a Unknown severity vulnerability in IDOR and missing authorization in the Prospero Flow CRM transaction API allow cross-tenant reading of financial records. The current sources do not mark it as known exploited. The current feed maps Roskus/Prospero Flow CRM (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 21, 2026Updated Aug 21, 2026Source checked Aug 21, 2026First seen by HOL Aug 21, 2026Material review Aug 21, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Roskus/Prospero Flow CRM (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Roskus/Prospero Flow CRMgeneric	>=5.0.0 <5.3.6	5.3.6

Recommended response

Check inventory. Check lockfiles and deployed manifests for Roskus/Prospero Flow CRM.
Review the reported fix. Update Roskus/Prospero Flow CRM to 5.3.6 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 21, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 21, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.