If a malformed data is input to the affected product, a CSV file downloaded from the affected product may contain such malformed data. When a victim user download and open such a CSV file, the embedded code may be executed in the user's environment. 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 Active

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

No data.

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 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 If a malformed data is input to the affected product, a CSV file downloaded from the affected product may contain such malformed data. When a victim user download and open such a CSV file, the embedded code may be executed in the user's environment. 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-1236
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': 4.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L'}
cve-icon MITRE

Status: PUBLISHED

Assigner: jpcert

Published: 2026-02-04T07:04:04.422Z

Updated: 2026-02-04T15:55:26.690Z

Reserved: 2026-01-29T02:02:27.800Z

Link: CVE-2026-24447

cve-icon Vulnrichment

Updated: 2026-02-04T15:55:22.739Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-04T07:16:01.560

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

Link: CVE-2026-24447

cve-icon Redhat

No data.