CVE-2026-29204
Insufficient ownership check in clientarea.php allows an authenticated client area user to submit requests using another user’s addonId without any...
- Published
- May 12, 2026
- Updated
- May 12, 2026
- Assigning CNA
- hackerone
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NLow · next 30 days
- Percentile
- 25.0%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1Provides community notes and an optional temporary hook to guard against CVE-2026-29204, a WHMCS client area addonId ownership vulnerability, with upgrade guidance.
Responsible use
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