Medium severity · published Aug 21, 2026
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
5.3
CVSS
0.4%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PF
Prospero Flow CRM · Roskus
4.9.1 before 5.14.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-77780
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-77780
github.com
https://github.com/Roskus/prospero-flow-crm/commit/5fd1fe862bbdcbacf5d7e05c1c123981d8809674
github.com
https://github.com/Roskus/prospero-flow-crm/pull/261
secur0.com
https://secur0.com/en/cna/cve-list/cve-2026-77780-idor-unvalidated-bank-foreign-keys-prospero-transaction-save
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