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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
WebPros WHMCS unaffected
Version Status Constraints
7.4.0 affected ≤ 18.12.2
18.13.0 affected < 18.13.3
9.0.0 affected < 9.0.4

No data.

No data.

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Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://help.whmcs.com/m/125386/l/2073908-cve-2026-29204 cve-icon cve-icon
History

Tue, 12 May 2026 22:30:00 +0000

Type Values Removed Values Added
References

Tue, 12 May 2026 22:15:00 +0000

Type Values Removed Values Added
Description Insufficient ownership checks in `clientarea.php` allow 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 resources and their cPanel account. 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.
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N'}

 ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Tue, 12 May 2026 21:00:00 +0000

Type Values Removed Values Added
Title Unauthorized cPanel Access via Missing Addon ID Ownership Verification in WHMCS

Tue, 12 May 2026 18:15:00 +0000

Type Values Removed Values Added
Description Insufficient ownership checks in `clientarea.php` allow 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 resources and their cPanel account.
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2026-05-12T21:57:08.277Z

Reserved: 2026-03-04T15:00:09.267Z

Link: CVE-2026-29204

cve-icon Vulnrichment

Updated: 2026-05-12T21:12:59.156Z

cve-icon NVD

Status : Received

Published: 2026-05-12T18:16:51.030

Modified: 2026-05-12T22:16:33.300

Link: CVE-2026-29204

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-12T20:45:23Z

Weaknesses