Vulnerability · Published Feb 4, 2026 · Assigned by jpcert
CVE-2026-24447
Medium 6.5
In plain English
A medium-severity security flaw in Movable Type Advanced (Software Edition) from Six Apart Ltd.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Six Apart Ltd. | Movable Type (Software Edition) | 9.0.4 to 9.0.5 (9.0 series)8.8.0 to 8.8.1 (8.8 series)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)8.8.0 to 8.8.1 (8.8 series)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)2.13 and earlier (MTP 2 series) |
| Six Apart Ltd. | Movable Type Premium (Advanced Edition) (Software Edition) | 9.0.4 (MTP 9.0 series)2.13 and earlier (MTP 2 series) |
| Six Apart Ltd. | Movable Type (Cloud Edition) | 9.0.5 (9 series)8.8.1 (8 series) |
| Six Apart Ltd. | Movable Type Premium (Cloud Edition) | 9.0.5 (9 series)2.12 (MTP 2 series) |
Weakness: CWE-1236 · Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L