EUVD-2026-26732Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Authenticated attackers with Subscriber-level access can modify the profile avatar of any WordPress user, including administrators, via an Insecure Direct Object Reference in the App Builder - Create Native Android & iOS Apps On The Flight plugin versions up to 5.6.0. The /wp-json/app-builder/v1/upload-avatar endpoint fails to validate that the authenticated user owns the target account before processing avatar uploads, allowing privilege escalation and account compromise through arbitrary user_id parameter submission in POST requests. No public exploit code or active exploitation has been identified at time of analysis.
Technical ContextAI
The vulnerability exists in the upload_avatar() function within the App Builder plugin's REST API endpoint. The root cause is classified as CWE-639 (Authorization Bypass Through User-Controlled Key), specifically an Insecure Direct Object Reference (IDOR). The endpoint accepts user_id as an attacker-controlled parameter in the POST request body and directly uses it to update WordPress user meta (profile avatar data) without performing authorization checks to verify the authenticated requester has permission to modify that specific user account. The flaw affects the Permission trait and UploadAvatar service classes across multiple affected versions. This is a classic authorization validation bypass in a REST API endpoint that should restrict operations to the authenticated user's own account or require elevated administrative privileges.
RemediationAI
The primary remediation is to update the App Builder plugin to a version newer than 5.6.0 once released by the vendor. Until an official patch is available, WordPress administrators should deactivate the App Builder plugin entirely if not actively required for production functionality. As a network-level compensating control, restrict REST API access to the /wp-json/app-builder/v1/upload-avatar endpoint using Web Application Firewall (WAF) rules or .htaccess restrictions, blocking all POST requests to this endpoint and allowing it only from trusted IP ranges if the functionality must remain active. Implement least-privilege access controls by limiting plugin activation to trusted administrators only and regularly audit user role assignments to minimize the number of Subscriber-level accounts that could exploit this vulnerability. Monitor WordPress user meta modification logs (via security plugins like Wordfence or similar) for unexpected avatar changes on high-privilege accounts. Note that deactivating the plugin entirely is the safest interim mitigation, as the IDOR is fundamental to the endpoint design.
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External POC / Exploit Code
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