CVE-2026-59234 Authorization Bypass Through User-Controlled Key in Prospero Flow CRM calendar event deletion
Authenticated attackers can delete other users' calendar events by manipulating the event ID, requiring a patch to enforce ownership 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-2026-59234?
CVE-2026-59234 is a medium-severity missing authorization vulnerability in Roskus Prospero Flow CRM, published on 3 Jul 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 (CWE-639) in CalendarDeleteEventController (app/Http/Controllers/Calendar/CalendarDeleteEventController.php), exposed at GET /calendar/event/delete/{id}, in Prospero Flow CRM before 5.5.3 allows a remote, authenticated attacker to delete arbitrary calendar events belonging to other users by manipulating the {id} path parameter, because the delete handler resolves the record with Calendar::find($id)->delete() and performs no ownership check (no user_id/company_id scoping) before deletion. This results in unauthorized destruction of other users' calendar events across the platform.
Weakness: CWE-639
Which versions are affected by CVE-2026-59234?
How do I fix CVE-2026-59234?
No fix has been published for CVE-2026-59234 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-2026-59234 being exploited?
There is no known exploitation of CVE-2026-59234 in the wild and no public exploit code.
Sources
Also known as GHSA-q2f8-hpwm-236j.