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Prospero Flow CRM CVE-2026-59234

| EUVDEUVD-2026-41539 MEDIUM
Authorization Bypass Through User-Controlled Key (CWE-639)
2026-07-03 4daa8cea-433a-44bd-9456-53b127fc289a GHSA-q2f8-hpwm-236j
Authentication Bypass PHP
6.9
CVSS 4.0 · Vendor: 4daa8cea-433a-44bd-9456-53b127fc289a
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Severity by source

Vendor (4daa8cea-433a-44bd-9456-53b127fc289a) PRIMARY
6.9 MEDIUM
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
vuln.today AI
5.4 MEDIUM

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.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (4daa8cea-433a-44bd-9456-53b127fc289a).

CVSS VectorVendor: 4daa8cea-433a-44bd-9456-53b127fc289a

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jul 03, 2026 - 14:01 EUVD
Analysis Generated
Jul 03, 2026 - 13:33 vuln.today

DescriptionCVE.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

{id} path parameter in GET /calendar/event/delete/{id}. The delete handler calls Calendar::find($id)->delete() with no user_id or company_id scoping, meaning possession of a valid session is the only gate to destroying arbitrary records. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with any valid CRM account
Delivery
Identify sequential calendar event ID pattern
Exploit
Iterate GET /calendar/event/delete/{id} requests
Execution
Bypass ownership check in CalendarDeleteEventController
Impact
Delete arbitrary users' calendar events platform-wide
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated session on the target Prospero Flow CRM instance - any user account with access to the calendar module suffices. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS 4.0 score of 6.9 (Medium) reflects limited-scope data destruction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with a legitimate low-privilege account logs into the CRM and identifies the numeric ID of their own calendar event (e.g., /calendar/event/delete/42). They then iterate over adjacent integer values - /calendar/event/delete/1 through /calendar/event/delete/1000 - sending GET requests for each, silently deleting calendar events belonging to other users or administrators across the platform. …
Remediation Upgrade to Prospero Flow CRM v5.5.3 or later; this version contains the confirmed fix per the GitHub release at https://github.com/Roskus/prospero-flow-crm/releases/tag/v5.5.3 and the upstream patch commit 8c26eed4d80544c30e55448e12a8e999af6d2b70 at https://github.com/Roskus/prospero-flow-crm/commit/8c26eed4d80544c30e55448e12a8e999af6d2b70. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-59234 vulnerability details – vuln.today
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