CVE-2026-27708
FOSSBilling: IDOR in Servicecustom Client API allows cross-client data access
FOSSBilling is a free, open-source billing and client management system. In versions 0.7.2 and prior, the Servicecustom Client API's __call method accepts an order_id parameter and fetches the associated order without verifying the authenticated client owns it, potentially exposing cross-client data through IDOR. An authenticated client can access any other client's custom service by guessing sequential order IDs. This can lead to a confidentiality breach — attackers can read client PII (name, email, phone, address, company details, VAT number) and service configuration data belonging to other clients. This issue has been fixed in version 0.8.0.
| CWE | CWE-284 CWE-639 CWE-862 |
| Vendor | fossbilling |
| Product | fossbilling |
| Published | Jun 24, 2026 |
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