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CVE-2026-29204

Insufficient ownership check in `clientarea.php` allows an authenticated client area user to submit requests using another user’s `addonId`

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 18.13.3, 9.0.4
1 proof of concept on GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • WebPros WHMCS

    From 7.4.0 · through 18.12.2; From 18.13.0 · fixed in 18.13.3; From 9.0.0 · fixed in 9.0.4

References 2

help.whmcs.com

GitHub · bogdanrotariu/cve-2026-29204-whmcs-clientarea-addonid