CVE-2026-29204

State: Published
Severity: 9.1 Critical
Published: May 12, 2026
Updated: May 12, 2026
Reserved: Mar 4, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	hackerone

Weaknesses

CWE-639 Insecure Direct Object Reference (IDOR)

Affected Products

Product	Versions
WHMCSWebPros	7.4.0 through 18.12.2Affected 18.13.0 to before 18.13.3Affected 9.0.0 to before 9.0.4Affected

References

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

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