What’s Vulnerable › Vulnerabilities
CVE-2026-29204
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-05-12 · updated 2026-10-26
- Weakness: CWE-639
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
- WebPros WHMCS: from 7.4.0 through 18.12.2; from 18.13.0 before 18.13.3; from 9.0.0 before 9.0.4 — fixed in 18.13.3, 9.0.4
How to fix
Upgrade to a fixed version: WebPros WHMCS 18.13.3, 9.0.4. Check the vendor advisory for mitigations.
References
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