What’s Vulnerable › Vulnerabilities

CVE-2026-77780: Unvalidated bank account and card foreign keys in the Prospero Flow CRM transaction save endpoint allow cross-tenant disclosure of banking identifiers

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-21 · updated 2026-10-15
• Weakness: CWE-639

Description

Authorization Bypass Through User-Controlled Key in the transaction save endpoint in Roskus Prospero Flow CRM 4.9.1 through 5.14.0 allows a user with transaction and accounting creation permissions to disclose another company's bank account name, bank name and card last four digits via a bank_account_id or bank_card_id belonging to that company in POST /transaction/save, which is persisted and rendered without any company ownership check.

Affected products

• Roskus Prospero Flow CRM: from 4.9.1 before 5.14.2 — fixed in 5.14.2

How to fix

Upgrade to a fixed version: Roskus Prospero Flow CRM 5.14.2. Check the vendor advisory for mitigations.

References

• https://github.com/Roskus/prospero-flow-crm/commit/5fd1fe862bbdcbacf5d7e05c1c123981d8809674
• https://github.com/Roskus/prospero-flow-crm/pull/261
• https://secur0.com/en/cna/cve-list/cve-2026-77780-idor-unvalidated-bank-foreign-keys-prospero-transaction-save

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