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CVE-2026-59236: Authorization bypass in Prospero Flow CRM Excel import allows cross-tenant record injection

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-15 · updated 2026-10-24
• Weakness: CWE-639

Description

Authorization Bypass Through User-Controlled Key (CWE-639) in the Excel import handlers (CustomerImport, LeadImport, ProductImport) in Roskus Prospero Flow CRM before 5.14.0 allows a remote, authenticated user of any role or company to create customer, lead, and product records inside another company's tenant via a spreadsheet whose company_id column points to the victim tenant, uploaded to POST /customer/import/excel/save, which maps company_id directly from the file and performs no check that it matches the authenticated user's company.

Affected products

• Roskus Prospero Flow CRM: from 1.0.0 before 5.14.0 — fixed in 5.14.0

How to fix

Upgrade to a fixed version: Roskus Prospero Flow CRM 5.14.0. Check the vendor advisory for mitigations.

References

• https://github.com/Roskus/prospero-flow-crm/commit/bdd6c9770a7435a45f0411154671b8a3e94dcdaa
• https://github.com/Roskus/prospero-flow-crm/releases/tag/v5.14.0
• https://secur0.com/en/cna/cve-list/cve-2026-59236-authorization-bypass-in-prospero-flow-crm-excel-import-allows-cross-tenant-record-injection

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