CVE-2026-53640: Fossbilling

Low severity, CVSS 2.3. EPSS: 0.4% chance of exploitation in the next 30 days.

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, low-privileged staff accounts may read sensitive data via admin API endpoints that lack permission checks. While sibling write endpoints correctly enforce fine-grained permissions, the corresponding read endpoints have no authorization guards. Version 0.8.0 contains a fix. Some workarounds are available. Restrict staff accounts to only those who need access to sensitive data and/or use a reverse proxy or WAF to restrict access to the affected endpoints.

Affected products

• Fossbilling Fossbilling: before 0.8.0 (fixed in 0.8.0)

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