# CVE-2026-24447

## Summary

- **CVE ID:** CVE-2026-24447
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (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)
- **CWE:** CWE-1236
- **Published:** Feb 4, 2026
- **Last Modified:** Mar 12, 2026

## 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.

## Affected Products

- Six Apart Ltd. — Movable Type (Software Edition) (9.0.4 to 9.0.5 (9.0 series))
- Six Apart Ltd. — Movable Type (Software Edition) (8.8.0 to 8.8.1 (8.8 series))
- Six Apart Ltd. — Movable Type (Software Edition) (8.0.2 to 8.0.8 (8.0 series))
- Six Apart Ltd. — Movable Type Advanced (Software Edition) (9.0.4 to 9.0.5 (9.0 series))
- Six Apart Ltd. — Movable Type Advanced (Software Edition) (8.8.0 to 8.8.1 (8.8 series))
- Six Apart Ltd. — Movable Type Advanced (Software Edition) (8.0.2 to 8.0.8 (8.0 series))
- Six Apart Ltd. — Movable Type Premium (Software Edition) (9.0.4 (MTP 9.0 series))
- Six Apart Ltd. — Movable Type Premium (Software Edition) (2.13 and earlier (MTP 2 series))
- Six Apart Ltd. — Movable Type Premium (Advanced Edition) (Software Edition) (9.0.4 (MTP 9.0 series))
- Six Apart Ltd. — Movable Type Premium (Advanced Edition) (Software Edition) (2.13 and earlier (MTP 2 series))
- Six Apart Ltd. — Movable Type (Cloud Edition) (9.0.5 (9 series))
- Six Apart Ltd. — Movable Type (Cloud Edition) (8.8.1 (8 series))
- Six Apart Ltd. — Movable Type Premium (Cloud Edition) (9.0.5 (9 series))
- Six Apart Ltd. — Movable Type Premium (Cloud Edition) (2.12 (MTP 2 series))

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.22%
- **EPSS Percentile:** 13.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._