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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact Low

No CVSS v3.1

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction Required

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Six Apart
  • Movable Type
Six Apart Ltd
  • Movable Type

No data.

No data.

References
Link Providers
https://jvn.jp/en/jp/JVN45405689/ cve-icon cve-icon
https://movabletype.org/news/2026/02/mt-906-released.html cve-icon cve-icon
https://www.sixapart.jp/movabletype/news/2026/02/04-1100.html cve-icon cve-icon
History

Wed, 04 Feb 2026 21:30:00 +0000

Type Values Removed Values Added
First Time appeared Six Apart
Six Apart movable Type
Six Apart Ltd
Six Apart Ltd movable Type
Vendors & Products Six Apart
Six Apart movable Type
Six Apart Ltd
Six Apart Ltd movable Type

Wed, 04 Feb 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 04 Feb 2026 07:15:00 +0000

Type Values Removed Values Added
Description 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.
Weaknesses CWE-434
References
Metrics cvssV3_0

{'score': 6.5, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L'}

cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L'}
cve-icon MITRE

Status: PUBLISHED

Assigner: jpcert

Published: 2026-02-04T07:03:37.889Z

Updated: 2026-02-04T16:07:28.812Z

Reserved: 2026-01-29T02:02:31.425Z

Link: CVE-2026-23704

cve-icon Vulnrichment

Updated: 2026-02-04T16:07:24.684Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-04T07:16:01.387

Modified: 2026-02-04T16:33:44.537

Link: CVE-2026-23704

cve-icon Redhat

No data.