App Builder <= 5.6.1 - Insecure Direct Object Reference to Authenticated (Subscriber+) Arbitrary User Avatar Modification via 'user_id' Parameter
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 5.6.1. 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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | App Builder – Create Native Android & iOS Apps On The Flight | <= 5.6.1 | 5.7.0 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N- Weakness (CWE)
CWE-639- Platform
- WordPress
- Package
App Builder – Create Native Android & iOS Apps On The Flight- Disclosed
- 01.05.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
Wordfence Intelligence - 2d532ffc-c6f1-41e3-9a59-0706802ab8e2 - Wordfence Intelligence
Copyright 1999-2026 The MITRE Corporation
Copyright 2012-2026 Defiant Inc.
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Vulnerability history: App Builder – Create Native Android & iOS Apps On The Flight
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 7
- First → latest
- 04.2024 05.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- High 1
- Medium 6
Disclosures per year
- 2024: 4
- 2025: 1
- 2026: 2
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App Builder <= 5.6.1 - Insecure Direct Object Reference to Authenticated (Subscriber+) Arbitrary User Avatar Modification via 'user_id' Parameter this entry
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