CVE-2026-53640
LowCVSS 2.3Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
FOSSBilling prior to version 0.8.0 contains a vulnerability where low-privileged staff accounts can read sensitive data via admin API endpoints lacking permission checks. Write endpoints correctly enforce fine-grained permissions, but the corresponding read endpoints have no authorization guards.
Risk Assessment
The risk involves unauthorized access to sensitive customer and system data by low-privileged staff, potentially leading to information disclosure and privacy breaches.
Recommendation
Immediately upgrade FOSSBilling to version 0.8.0 or later. As a temporary workaround, restrict staff accounts to only those who need access to sensitive data and use a reverse proxy or WAF to block access to the affected endpoints.
Original NVD description (English source)
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.