🛡️ CVE-2026-42331

⚪ Unknown ✅ No Known Exploit CWE-306 NVD
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, the Guest API invoice/update endpoint is missing an authorization check present in other invoice-related endpoints, allowing an unauthenticated user with knowledge of an invoice hash to modify the payment gateway associated with an unpaid invoice. An attacker who obtains an invoice hash, which may leak through shared URLs, referrer headers, or email links, can change the gateway_id on an unpaid invoice to any payment gateway configured in the system. This does not allow redirecting payments to an arbitrary external endpoint, as the gateway must already be installed and configured by an administrator. The practical impact is further limited by the invoice_accessible_from_hash system setting. Version 0.8.0 contains a patch. No known workarounds are available.

Weakness class

CVE-2026-42331 is classified as CWE-306: Missing Authentication for Critical Function. A sensitive function can be reached without authenticating at all.

Affected software

CVE-2026-42331 is recorded against 1 package.

  • unknown

Timeline and source

Published on 6 July 2026 and last revised on 7 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com
github.com

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE CWE-306
Public Exploit ✅ No
Source NVD
Published 2026-07-06
Updated 2026-08-11
Modified 2026-07-07
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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