CVE-2026-44259 MEDIUM

CVE-2026-44259: efw4.X: Stored XSS via previewServlet

Vendor Efwgrp
Product efw4.X
Weakness CWE-80 · XSS · basic
Published May 12, 2026
Last update May 13, 2026

CVSS base score

4.6/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

What the vulnerability does

01Description

efw4.X is an Enterprise Framework for Web. Prior to 4.08.010, the previewServlet serves files with their detected MIME type based on file extension, without any content sanitization or security headers. Files with .html, .htm, or .svg extensions are served as text/html or image/svg+xml respectively, causing any embedded JavaScript to execute in the victim's browser within the application's origin. This vulnerability is fixed in 4.08.010.

Key dates

02Disclosure timeline

May 12, 2026 CVE published
May 13, 2026 Record updated