CVE-2026-53643: Fossbilling

High severity, CVSS 8.7. EPSS: 0.4% chance of exploitation in the next 30 days.

FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 allow low-privileged staff accounts to perform unauthorized actions via admin API endpoints. The root cause is a combination of the `can_always_access` module flag (which grants all staff access to certain modules) and insufficient permission checks or unsafe parameter handling on individual endpoints. Version 0.8.0 contains a fix. Some workarounds are available. Restrict staff accounts to only those who need access to sensitive settings and/or use a reverse proxy or WAF to restrict access to the affected endpoints to trusted IP addresses or higher-privilege roles.

Affected products

• Fossbilling Fossbilling: before 0.8.0 (fixed in 0.8.0)

Published 2026-07-06. Last modified 2026-07-07.