CVE-2026-43925 - FOSSBilling: Mass assignment of group_id in guest client registration allows unauthorized promo code us

[Starburst-David]

CVE ID: CVE-2026-43925
Published: July 6, 2026
Description: FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, an unauthenticated mass assignment vulnerability in the client self-registration endpoint allows any visitor to assign themselves to an arbitrary client group during sign-up. Because client groups can gate promo code eligibility, an attacker may apply group-restricted discount codes and receive unauthorized discounts. Version 0.8.0 contains a patch. As a workaround, administrators can either remove group restrictions from promo codes or disable client self-registration (Settings → Clients → Disable signup).
Severity: 6.9 | MEDIUM

More Information:
https://cvefeed.io/vuln/detail/CVE-2026-43925