CVE-2026-29204 PUBLISHED

Assigner: hackerone
Reserved: 04.03.2026 Published: 12.05.2026 Updated: 12.05.2026

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.

Metrics

CVSS 3.1

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

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	WebPros
Product	WHMCS
Versions	Default: unaffected affected from 7.4.0 to 18.12.2 (incl.) affected from 18.13.0 to 18.13.3 (excl.) affected from 9.0.0 to 9.0.4 (excl.)

References

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

Problem Types

CWE-639 Insecure Direct Object Reference (IDOR) CWE