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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| WebPros | WHMCS | 7.4.0 – ≤ 18.12.2, 18.13.0 – < 18.13.3, 9.0.0 – < 9.0.4 | 18.13.3 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
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bogdanrotariu/cve-2026-29204-whmcs-clientarea-addonid ★ 0 · May 13, 2026
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.