What is CVE-2026-29204?

CVE-2026-29204 is a critical-severity vulnerability in Webpros Whmcs, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.1/10. Published 2026-05-12.

How severe is CVE-2026-29204?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Is CVE-2026-29204 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Webpros Whmcs

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 ownership validation leading to unauthorized access to the victim's account.

Vulnerability class: IDOR (Insecure Direct Object Reference)

EPSS: 0.000 (13.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Webpros Whmcs — versions 8.13.0, 7.4.0, 9.0.0

Weakness classification (CWE)

CWE-639 — Authorization Bypass Through User-Controlled Key

Public proof-of-concept exploits

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

References

Frequently asked questions

What is CVE-2026-29204?: CVE-2026-29204 is a critical-severity vulnerability in Webpros Whmcs, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 9.1/10. Published 2026-05-12.
How severe is CVE-2026-29204?: Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2026-29204 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.