CSV File Execution Vulnerability in Movable Type by Six Apart
CVE-2026-24447

4.8MEDIUM

Key Information:

Vendor

Six Apart Ltd.

Status
Movable Type (software Edition)
Movable Type Advanced (software Edition)
Movable Type Premium (software Edition)
Movable Type Premium (advanced Edition) (software Edition)
Vendor
CVE Published:
4 February 2026

What is CVE-2026-24447?

This vulnerability arises when malformed data is input into Movable Type, resulting in a CSV file containing this corrupted data. When users download and open the affected CSV file, the malicious code embedded within may execute in their environment, potentially compromising user systems. Notably, both Movable Type 7 and 8.4 series, which have reached their End-of-Life status, are impacted by this issue.

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Affected Version(s)

Movable Type (Cloud Edition) 9.0.5 (9 series)

Movable Type (Cloud Edition) 8.8.1 (8 series)

Movable Type (Software Edition) 9.0.4 to 9.0.5 (9.0 series)

References

https://movabletype.org/news/2026/02/mt-906-released.html
https://www.sixapart.jp/movabletype/news/2026/02/04-1100....
https://jvn.jp/en/jp/JVN45405689/

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

CVSS V3.0

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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