Authorization bypass in appcheap App Builder – Create Native Android & iOS Apps On The…
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-7638
- 2026-10-03 Alias added: GHSA-5rjg-2j76-x2r5
References
Other 10
- https://www.wordfence.com/threat-intel/vulnerabilities/id/2d532ffc-c6f1-41e3-9a59-0706802ab8e2?source=cve
- https://plugins.trac.wordpress.org/browser/app-builder/trunk/includes/Di/Service/Auth/UploadAvatar.php#L80
- https://plugins.trac.wordpress.org/browser/app-builder/tags/5.6.0/includes/Di/Service/Auth/UploadAvatar.php#L80
- https://plugins.trac.wordpress.org/browser/app-builder/trunk/includes/Di/Service/Auth/UploadAvatar.php#L161
- https://plugins.trac.wordpress.org/browser/app-builder/tags/5.6.0/includes/Di/Service/Auth/UploadAvatar.php#L161
- https://plugins.trac.wordpress.org/browser/app-builder/trunk/includes/Traits/Permission.php#L33
- https://plugins.trac.wordpress.org/browser/app-builder/tags/5.6.0/includes/Traits/Permission.php#L33
- https://plugins.trac.wordpress.org/browser/app-builder/tags/5.5.10/includes/Di/Service/Auth/UploadAvatar.php#L80
- https://plugins.trac.wordpress.org/browser/app-builder/tags/5.5.10/includes/Di/Service/Auth/UploadAvatar.php#L161
- https://plugins.trac.wordpress.org/browser/app-builder/tags/5.5.10/includes/Traits/Permission.php#L33
More appcheap vulnerabilities
- TI-2024-08635 Weak password recovery in appcheap App Builder – Create Native Android & iOS Apps On The… CVSS 3.1CRITICAL 9.8
- TI-2026-02010 Improper privilege management in appcheap App Builder – Create Native Android & iOS Apps… CVSS 3.1MEDIUM 6.5
- TI-2025-30497 WordPress Push notification for Mobile and Web app plugin <= 2.0.3 - Broken Access Control vulnerability CVSS 3.1MEDIUM 6.5
- TI-2024-07091 SQL injection in appcheap App Builder – Create Native Android & iOS Apps On The Flight CVSS 3.1HIGH 7.5
- TI-2025-31904 WordPress App Builder plugin <= 5.5.6 - Broken Access Control vulnerability CVSS 3.1MEDIUM 5.3
- TI-2024-20658 WordPress App Builder plugin <= 3.8.7 - Open Redirection vulnerability CVSS 3.1MEDIUM 6.1
Sources
- CVE-2026-7638 · CVE Program
- CVE-2026-7638 · NVD
- FIRST EPSS
- GHSA-5rjg-2j76-x2r5 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences