CVE-2026-67398: CWE-862 Missing Authorization in WebPros WHMCS
Description
Missing authorization vulnerability has been discovered in 2Checkout payment gateway of WHMCS from 8.13.0 before 8.13.7, 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.
CVSS v4.0
Score 8.2high
Affected software
WebPros
WHMCS
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-67398 is a missing authorization vulnerability in the 2Checkout payment gateway component of WHMCS, affecting versions >=4.5.0 <8.12.2, >=8.13.0 <8.13.7, and >=9.0.0 <9.0.8. The flaw allows unauthenticated users to retrieve customer data by accessing a specific endpoint without proper authorization checks. The vulnerability is classified under CWE-862 and has a high CVSS 4.0 score of 8.2, indicating network attack vector with low complexity and no privileges or user interaction required. No vendor advisory or patch information is provided, and no known exploits are reported.
Potential Impact
An unauthenticated attacker can access sensitive customer data from WHMCS installations using the vulnerable 2Checkout payment gateway endpoint. This exposure can lead to data confidentiality breaches affecting customers of the WHMCS platform. The vulnerability does not require user interaction or privileges, increasing the risk of exploitation if conditions are met.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to the vulnerable endpoint and monitor for unusual access patterns. Avoid exposing the 2Checkout payment gateway endpoint to untrusted networks if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- hackerone
- Date Reserved
- 2026-07-29T15:00:02.294Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a9a0bccacd9273b49a7b13c
Added to database: 09/04/2026, 00:07:40 UTC
Last enriched: 09/14/2026, 22:21:59 UTC
Last updated: 10/17/2026, 18:48:21 UTC
Views: 182
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