CVE-2026-29204

Published: May 12, 2026

Modified: May 12, 2026

PUBLISHED

CVSS v3.1

9.1

CRITICAL

Description

Insufficient ownership check in `clientarea.php` allows an authenticated client area user to submit requests using another user’s `addonId` without any ownership validation leading to unauthorized access to the victim's account.

Vendor	Product	Versions
WebPros	WHMCS	affected `7.4.0 - <= 18.12.2` affected `18.13.0 - < 18.13.3` affected `9.0.0 - < 9.0.4`

Weaknesses (CWE)

CWE-639

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

References

https://help.whmcs.com/m/125386/l/2073908-cve-2026-29204

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CVE-2026-29204

Description

Affected Products

Weaknesses (CWE)

CVSS v3.1 Details

References