CVE-2026-67398
Received Received - Intake

Missing Authorization in WHMCS via 2Checkout Payment Gateway

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: HackerOne

Description
Missing authorization vulnerability has been discovered in 2Checkout payment gateway of WHMCS from 8.13.0 before 8.13.8, from 9.0.0 before 9.0.8, all other EOL versions from 4.5.0. The vulnerability allows an unauthenticated user to get WHMCS customer's data via 2Checkout payment gateway's endpoint under specific conditions.

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Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-04
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-67398
EUVD
EUVD-2026-70849

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
whmcs whmcs to 8.13.8 (exc)
whmcs whmcs to 9.0.8 (exc)
whmcs whmcs 4.5.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-862 The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

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Executive Summary

CVE-2026-67398 is a missing authorization vulnerability in WHMCS's 2Checkout payment gateway affecting versions 4.5.0 and later. It allows unauthenticated users to access sensitive customer data like names, addresses, emails, and phone numbers through a specific endpoint under certain conditions.

Impact Analysis

This vulnerability could lead to unauthorized access to customer personally identifiable information (PII) such as names, addresses, emails, and phone numbers. Attackers could exploit it to steal sensitive data without authentication.

Mitigation Strategies

Upgrade WHMCS to version 9.0.8 or 8.13.7 or later. As a temporary workaround, disable the 2CheckOut payment gateway module via the WHMCS admin panel under System Settings > Payment Gateways.

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