CVE-2026-53640 - FOSSBilling missing authorization checks on read-only admin API endpoints expose sensitive staff, clien

[Starburst-David]

CVE ID: CVE-2026-53640
Published: July 6, 2026
Description: 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.
Severity: 2.3 | LOW

More Information:
https://cvefeed.io/vuln/detail/CVE-2026-53640