mall4j through 4.0 Unrestricted File Upload in Admin File Endpoints

Advisories

mall4j through 4.0 Unrestricted File Upload in Admin File Endpoints

severity: low
date: 9/28/2026
Affecting: mall4j <= 4.0
CVE: CVE-2026-102366
CWE: CWE-434 Unrestricted Upload of File with Dangerous Type
CVSS: 2.1
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
References: https://github.com/LinYuanyi1/cve-request-poc/blob/114b3f0d149e50a7678f591bf8043399fc9ac96c/mall4j/A03_admin_file_upload_xss.py
https://github.com/gz-yami/mall4j
https://github.com/gz-yami/mall4j/blob/ffc672fc1aa4320ce02d0b93853bb456ae0a4dae/yami-shop-admin/src/main/java/com/yami/shop/admin/controller/FileController.java#L44-L64
https://github.com/gz-yami/mall4j/blob/ffc672fc1aa4320ce02d0b93853bb456ae0a4dae/yami-shop-service/src/main/java/com/yami/shop/service/impl/AttachFileServiceImpl.java#L62-L81
VulnCheck Advisory: mall4j through 4.0 Unrestricted File Upload in Admin File Endpoints
Credit: Mingsheng Lin
Description: mall4j through 4.0 contains an unrestricted file upload vulnerability in FileController endpoints that lack authorization checks and accept arbitrary file types without validation. Attackers with any authenticated token can upload HTML or SVG files that execute scripts in administrator browsers when accessed from the local storage path, resulting in stored cross-site scripting.

Ready to get Started?

Explore VulnCheck, a next-generation Cyber Threat Intelligence platform, which provides exploit and vulnerability intelligence to help you prioritize and remediate vulnerabilities that matter.

Vulnerability Prioritization
Prioritize vulnerabilities that matter based on the threat landscape and defer vulnerabilities that don't.
Early Warning System
Real-time alerting of changes in the vulnerability landscape so that you can take action before the attacks start.

Schedule a Demo