CVE-2026-53645
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:L
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| FOSSBilling | FOSSBilling | < 0.8.0 | affected |
Weaknesses
- CWE-269: CWE-269: Improper Privilege Management
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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