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TI-2026-42375 Aliases CVE-2026-59234GHSA-q2f8-hpwm-236j

Authorization Bypass Through User-Controlled Key in Prospero Flow CRM calendar event deletion

Priority LOW 37CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00641 50th percentileScored 2026-11-07
Fix Fixed Prospero Flow CRM (Roskus): 5.5.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
RoskusProspero Flow CRM1.0.0 to before 5.5.35.5.3Patch availableCNA
  • Prospero Flow CRM VendorRoskus Affected 1.0.0 to before 5.5.3 Fixed in 5.5.3 Patch available CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:roskus:prospero_flow_crm:*:*:*:*:*:*:*:*——Roskus
  • cpe:2.3:a:roskus:prospero_flow_crm:*:*:*:*:*:*:*:* Versions — — ·Roskus

Remediation

  • Fix · CNA Prospero Flow CRM (Roskus) Fixed in 5.5.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-59234
  2. 2026-10-03 Alias added: GHSA-q2f8-hpwm-236j
  3. 2026-10-21 EPSS moved to the 50th–90th percentile

References

Patch 1

Other 2

  • TI-2026-54500 IDOR and missing authorization in Prospero Flow CRM supplier API allows cross-tenant read and modification CVSS 4.0CRITICAL 9.3
  • TI-2026-16110 Use of hard-coded credentials in Prospero Flow CRM employee onboarding CVSS 4.0CRITICAL 9.3
  • TI-2026-42380 Stored XSS in Prospero Flow CRM email body allows administrator account takeover CVSS 4.0HIGH 8.6
  • TI-2026-42376 Missing authorization in Prospero Flow CRM allows low-privileged users to read all bank accounts CVSS 4.0HIGH 8.7
  • TI-2026-54153 IDOR and missing authorization in the Prospero Flow CRM transaction API allow cross-tenant reading of financial records CVSS 4.0HIGH 8.7
  • TI-2026-42374 Missing Authorization in Prospero Flow CRM permission save endpoint allows privilege escalation CVSS 4.0HIGH 8.7
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences