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CVE-2026-29204

Quick assessment

Affected
WebPros WHMCS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WebPros WHMCS是瑞士WebPros公司的一个面向主机托管与域名服务商的客户管理与自动计费平台。 WebPros WHMCS存在安全漏洞，该漏洞源于clientarea.php中所有权检查不足，可能导致经过身份验证的客户端用户提交使用其他用户addonId的请求，导致未授权访问受害者账户。

CVSS 9.1 · Critical EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1136.001 · Local Account

Affected Version Matrix 3

VendorProduct Version RangeStatus
WebPros WHMCS 7.4.0≤ 18.12.2 affected
18.13.0< 18.13.3 affected
9.0.0< 9.0.4 affected
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I. Basic Information for CVE-2026-29204

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
WebPros WHMCS 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WebPros WHMCS是瑞士WebPros公司的一个面向主机托管与域名服务商的客户管理与自动计费平台。 WebPros WHMCS存在安全漏洞，该漏洞源于clientarea.php中所有权检查不足，可能导致经过身份验证的客户端用户提交使用其他用户addonId的请求，导致未授权访问受害者账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
WebPros WHMCS 7.4.0 ~ 18.12.2 -

II. Public POCs for CVE-2026-29204

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III. Intelligence Information for CVE-2026-29204

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Vendor Advisories for CVE-2026-29204 (1)

IV. Related Vulnerabilities

Same product: WHMCS
Same vendor: WebPros
Same weakness: CWE-639

V. Comments for CVE-2026-29204

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