Vulnerability · Published Feb 4, 2026 · Assigned by jpcert
CVE-2026-23704
Medium 6.5
In plain English
A medium-severity unrestricted file upload 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 14% of all known vulnerabilities).
Severity (CVSS 3.0)6.5Medium
Exploit odds (30 days)0.2%top 86.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
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-434 · Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L