EUVD-2026-41539
GHSA-q2f8-hpwm-236j
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
PR:L assigned because description explicitly requires authentication, overriding the erroneous PR:N in the supplied vector; C:N as no data is read, only deleted.
Primary rating from Vendor (4daa8cea-433a-44bd-9456-53b127fc289a).
CVSS VectorVendor: 4daa8cea-433a-44bd-9456-53b127fc289a
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Authorization bypass in Prospero Flow CRM before 5.5.3 allows any authenticated user to delete arbitrary calendar events belonging to other users by manipulating the event ID parameter in the GET endpoint /calendar/event/delete/{id}. The delete handler performs no ownership check (missing user_id scope) before deletion, enabling unauthorized destruction of calendar data. A patch is available in version 5.5.3; no public exploit or active exploitation has been identified at this time.
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Same technique Authentication Bypass
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External POC / Exploit Code
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