Query Construction Flaw in FOSSBilling's Client Management System
CVE-2026-23513

7.1HIGH

Key Information:

Vendor

Fossbilling

Status
Fossbilling
Vendor
CVE Published:
23 June 2026

What is CVE-2026-23513?

FOSSBilling, a free and open-source billing and client management system, suffered from a query construction flaw in its client list endpoints in versions up to 0.7.2. This vulnerability allowed authenticated clients to bypass tenant restrictions, thus exposing sensitive client data from other accounts. Specifically, due to SQL operator precedence issues, crafted requests could execute OR-based search actions without proper grouping, enabling access to confidential details like identifiers, amounts, status, timestamps, and related metadata. This issue was resolved in version 0.8.0, underscoring the necessity for vigilant security practices and timely updates.

Affected Version(s)

FOSSBilling < 0.8.0

References

https://github.com/FOSSBilling/FOSSBilling/security/advis...
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https://github.com/FOSSBilling/FOSSBilling/releases/tag/0...
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CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.