CVE-2026-23513: Fossbilling

High severity, CVSS 7.1. EPSS: 0.4% chance of exploitation in the next 30 days.

FOSSBilling is a free, open-source billing and client management system. In versions 0.7.2 and prior, a query-construction flaw in client list endpoints allowed authenticated clients to bypass tenant scoping and retrieve other clients’ data. Details In ServiceTransaction::getSearchQuery() and Order\Service::getSearchQuery(), OR-based search/action filters were appended without grouping, allowing SQL operator precedence to evaluate OR clauses independently of the enforced client_id constraint. Crafted requests could therefore return records and metadata belonging to other clients, including identifiers, amounts, status, timestamps, and related fields. This issue was fixed in version 0.8.0.

Affected products

• Fossbilling Fossbilling: before 0.8.0 (fixed in 0.8.0)

Published 2026-06-23. Last modified 2026-06-26.