CVE-2026-53643
HighCVSS 8.7Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
FOSSBilling 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 and insufficient permission checks or unsafe parameter handling on individual endpoints.
Risk Assessment
The risk is that low-privileged staff can access sensitive settings and perform unauthorized operations, potentially leading to confidentiality, integrity, or availability breaches.
Recommendation
Immediately upgrade to version 0.8.0. As a workaround, restrict staff accounts to only those who need access and use a reverse proxy or WAF to limit access to affected endpoints to trusted IP addresses or higher-privilege roles.
Original NVD description (English source)
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.