CVE-2026-53645 FOSSBilling's missing self-edit prevention in staff permission management allows persistent privilege escalation
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-53645?
CVE-2026-53645 is a high-severity vulnerability in FOSSBilling, published on 6 Jul 2026.
Official 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.
Weakness: CWE-269
Which versions are affected by CVE-2026-53645?
How do I fix CVE-2026-53645?
No fix has been published for CVE-2026-53645 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-53645 being exploited?
There is no known exploitation of CVE-2026-53645 in the wild and no public exploit code.
Sources
Also known as GHSA-4hf7-xxxw-64rm.