CVE-2026-53645 - FOSSBilling's missing self-edit prevention in staff permission management allows persistent privilege e

[Starburst-David]

CVE ID: CVE-2026-53645
Published: July 6, 2026
Description: FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 allow a low-privileged staff account to grant arbitrary module permissions to itself through the admin API, resulting in persistent privilege escalation. A staff user that only has `staff.create_and_edit_staff` can call `/api/admin/staff/permissions_update` targeting their own account and write any permission structure, bypassing the intended role-based access control boundary. Version 0.8.0 patches the issue. Some workarounds are available. Restrict the `staff.create_and_edit_staff` permission to only highly trusted staff members and/or use a reverse proxy or WAF to restrict access to `/api/admin/staff/permissions_update` to specific trusted roles.
Severity: 8.5 | HIGH

More Information:
https://cvefeed.io/vuln/detail/CVE-2026-53645