CVE-2026-53640 — FOSSBilling missing authorization checks on read-only admin API endpoints expose sensitive staff, client, and redirect data
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 th…
Published: 2026-07-06 · CVSS: 2.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7