CVE-2026-77759 IDOR and missing authorization in the Prospero Flow CRM transaction API allow cross-tenant reading of financial records
Authenticated users can read other companies' financial records by manipulating transaction IDs due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77759?
CVE-2026-77759 is a high-severity missing authorization vulnerability in Roskus Prospero Flow CRM, published on 21 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-639
Which versions are affected by CVE-2026-77759?
How do I fix CVE-2026-77759?
No fix has been published for CVE-2026-77759 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-77759 being exploited?
There is no known exploitation of CVE-2026-77759 in the wild and no public exploit code.
Sources
Also known as GHSA-cw49-mhmj-m3xc.