Vulnerability 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.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-53645?
CVE-2026-53645 is a documented vulnerability. 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 ...
How severe is CVE-2026-53645?
CVSS scoring is not yet available for CVE-2026-53645. Check NVD for updates.
Is there a patch for CVE-2026-53645?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.