CVE-2026-23704 MEDIUM

CVE-2026-23704

Vendor Six Apart Ltd.
Product Movable Type (Software Edition)
Weakness CWE-434 · Unrestricted file upload
Published February 4, 2026
Last update February 4, 2026

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

What the vulnerability does

01Description

A non-administrative user can upload malicious files. When an administrator or the product accesses that file, an arbitrary script may be executed on the administrator's browser. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.

Key dates

02Disclosure timeline

February 4, 2026 CVE published
February 4, 2026 Record updated