CVE-2026-102366
CVE-2026-102366
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.
Vulnerability class: Unrestricted File Upload
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Weakness classification (CWE)
References
- github.com/LinYuanyi1/cve-request-poc/blob/114b3f0d149e50a7678f591bf8043399fc9a… (exploit)
- github.com/gz-yami/mall4j (product)
- github.com/gz-yami/mall4j/blob/ffc672fc1aa4320ce02d0b93853bb456ae0a4dae/yami-sh… (technical-description)
- github.com/gz-yami/mall4j/blob/ffc672fc1aa4320ce02d0b93853bb456ae0a4dae/yami-sh… (technical-description)
- www.vulncheck.com/advisories/mall4j-through-4.0-unrestricted-file-upload-in-adm… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-102366?
- CVE-2026-102366 is a medium-severity vulnerability, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 4.4/10. Published 2026-09-29.
- How severe is CVE-2026-102366?
- Medium severity. CVSS v3 base score is 4.4 out of 10.