CVE-2026-102366 mall4j through 4.0 Unrestricted File Upload in Admin File Endpoints
Authenticated attackers can upload malicious files to trigger stored XSS in admin browsers, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-102366?
CVE-2026-102366 is a low-severity vulnerability in gz-yami mall4j, published on 28 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-434
Which versions are affected by CVE-2026-102366?
How do I fix CVE-2026-102366?
No fix has been published for CVE-2026-102366 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-102366 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-102366 exists.
Sources
Also known as GHSA-ffmx-jjx9-c9cx.