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CVE-2026-7638— App Builder <= 5.5.10 - Insecure Direct Object Reference to Authenticated (Subscriber+) Arbitrary User Avatar Modification via 'user_id' Parameter

Quick assessment

Affected
appcheap App Builder – Create Native Android & iOS Apps On The Flight
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.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin App Builder – Create Native Android & iOS Apps On The Flight 5.6.0及之前版本存在安全漏洞，该漏洞源于upload_avatar函数缺少授权验证，可能导

CVSS 5.3 · Medium EPSS 0.51% · P41

Possible ATT&CK Techniques 1 AI

T1136.001 · Local Account

Affected Version Matrix 1

VendorProduct Version RangeStatus
appcheap App Builder – Create Native Android & iOS Apps On The Flight ≤ 5.6.0 affected
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I. Basic Information for CVE-2026-7638

Vulnerability Information
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Vulnerability Title
App Builder <= 5.5.10 - Insecure Direct Object Reference to Authenticated (Subscriber+) Arbitrary User Avatar Modification via 'user_id' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The App Builder – Create Native Android & iOS Apps On The Flight plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to and including 5.6.0. This is due to missing authorization validation in the `upload_avatar()` function, which accepts an attacker-controlled `user_id` parameter from the POST request body and uses it to update user meta without verifying that the authenticated requester owns or has permission to modify the target account. This makes it possible for authenticated attackers, with Subscriber-level access and above, to overwrite the profile avatar of any arbitrary user on the site, including administrators, by supplying a target `user_id` in the request body to the `/wp-json/app-builder/v1/upload-avatar` endpoint.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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
WordPress plugin App Builder – Create Native Android & iOS Apps On The Flight 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin App Builder – Create Native Android & iOS Apps On The Flight 5.6.0及之前版本存在安全漏洞，该漏洞源于upload_avatar函数缺少授权验证，可能导
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
appcheap App Builder – Create Native Android & iOS Apps On The Flight 0 ~ 5.6.0 -

II. Public POCs for CVE-2026-7638

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III. Intelligence Information for CVE-2026-7638

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Vendor Advisories for CVE-2026-7638 (1)

IV. Related Vulnerabilities

Same product: App Builder – Create Native Android & iOS Apps On The Flight
Same vendor: appcheap
Same weakness: CWE-639

V. Comments for CVE-2026-7638

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