FOSSBilling up to 0.7.x Client Self-Registration Endpoint dynamically-determined object attributes

Summaryinfo

A vulnerability was found in FOSSBilling up to 0.7.x. It has been declared as problematic. Affected by this issue is some unknown functionality of the component Client Self-Registration Endpoint. Executing a manipulation can lead to dynamically-determined object attributes. The identification of this vulnerability is CVE-2026-43925. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in FOSSBilling up to 0.7.x and classified as problematic. This vulnerability affects some unknown processing of the component Client Self-Registration Endpoint. The manipulation with an unknown input leads to a dynamically-determined object attributes vulnerability. The CWE definition for the vulnerability is CWE-915. The product receives input from an upstream component that specifies multiple attributes, properties, or fields that are to be initialized or updated in an object, but it does not properly control which attributes can be modified. As an impact it is known to affect integrity. CVE summarizes:

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).

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-43925 since 05/04/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available.

Upgrading to version 0.8.0 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Billing Software

Name

• FOSSBilling

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7

Website

• Product: https://github.com/FOSSBilling/FOSSBilling/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion