CVE-2026-67398Network attack vector

Customer PII disclosure via unchecked 2Checkout endpoint

Published Sep 3, 2026 · Updated Sep 4, 2026

Missing authorization in WebPros WHMCS allows remote attackers to read customer PII through the 2Checkout gateway endpoint. The endpoint returns client names, postal addresses, email addresses, and phone numbers without performing the required authorization check. Exploitation requires the 2Checkout gateway to be active and additional undisclosed conditions; no data modification or service interruption is reported.

CVSS severity8.2
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in WebPros WHMCS allows remote attackers to read customer PII through the 2Checkout gateway endpoint. The endpoint returns client names, postal addresses, email addresses, and phone numbers without performing the required authorization check. Exploitation requires the 2Checkout gateway to be active and additional undisclosed conditions; no data modification or service interruption is reported.

The record

CVE
CVE-2026-67398
Published
Sep 3, 2026
Updated
Sep 4, 2026
Vendor
WebPros
Product
WHMCS
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.5.0 <=8.12.2
  2. Affected versionversion=8.13.0 <8.13.8
  3. Affected versionversion=9.0.0 <9.0.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

WebPros · WHMCSversion=4.5.0 <=8.12.2; version=8.13.0 <8.13.8; version=9.0.0 <9.0.8

Published CVSS scores

8.2HackerOne CNACVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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