FOSSBilling: Mass assignment of group_id in guest client registration allows unauthorized promo code use (CVE-2026-43925) | HOL Guard CVE

Medium · CVSS 6.9CVE-2026-43925

FOSSBilling: Mass assignment of group_id in guest client registration allows unauthorized promo code use

Answer in brief

CVE-2026-43925 records a Medium severity (CVSS 6.9) vulnerability in FOSSBilling: Mass assignment of group_id in guest client registration allows unauthorized promo code use. The current sources do not mark it as known exploited. The current feed maps FOSSBilling/FOSSBilling (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 6, 2026Updated Jul 7, 2026Source checked Sep 19, 2026First seen by HOL Jul 6, 2026Material review Jul 7, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.9
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps FOSSBilling/FOSSBilling (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
FOSSBilling/FOSSBillinggeneric	< 0.8.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for FOSSBilling/FOSSBilling.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jul 6, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 7, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 6, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source 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).

Quoted source text, attributed separately from HOL analysis.