PT-2026-56009 · Fossbilling · Fossbilling
7Megaumka7
+2
·
Published
2026-07-06
·
Updated
2026-07-06
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CVE-2026-42331
CVSS v4.0
7.7
High
| Vector | AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:H/SA:N |
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.Fix
Missing Authentication
Incorrect Authorization
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Related Identifiers
Affected Products
Fossbilling