CVE-2026-53645 – FOSSBilling’s missing self-edit prevention in staff permission management allows persistent privilege escalation

CVE ID :CVE-2026-53645

Published : July 6, 2026, 11:16 p.m. | 31 minutes ago

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

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