CVE-2026-53643 - FOSSBilling allows low-privileged staff accounts to perform unauthorized actions via admin API endpoint

[Starburst-David]

CVE ID: CVE-2026-53643
Published: July 6, 2026
Description: 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.
Severity: 8.7 | HIGH

More Information:
https://cvefeed.io/vuln/detail/CVE-2026-53643