CVE-2026-44392: Missing authorization vulnerability exists in Movable Type

Medium severity · published May 20, 2026

CVE-2026-44392

Missing authorization vulnerability exists in Movable Type

4.3

CVSS

0.2%

EPSS

On KEV

Description

Missing authorization vulnerability exists in Movable Type. Under certain conditions, when a user without administrator privileges signs in to the product, unintended update processing may be executed.

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Attack vector

Network

Complexity

Low

Privileges

Low

User interaction

None

Confidentiality

None

Integrity

Low

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.2% · higher than 16% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Movable Type · Six Apart Ltd.

9.1.1 and earlier; 9.0.7 and earlier; 8.8.3 and earlier; 8.0.10 and earlier · source: vendor

Movable Type Advanced · Six Apart Ltd.

9.1.1 and earlie; 9.0.7 and earlier; 8.8.3 and earlier; 8.0.10 and earlier · source: vendor

Movable Type Premium · Six Apart Ltd.

9.1.1 and earlier; 9.0.7 and earlier; 2.15 and earlier (included in Movable Type 8.8.4 and earlier or Movable Type 8.0.11 and earlier) · source: vendor

Movable Type Premium (Advanced Edition) · Six Apart Ltd.

9.1.1 and earlier; 9.0.7 and earlier; 2.15 and earlier (included in Movable Type 8.8.4 and earlier or Movable Type 8.0.11 and earlier) · source: vendor

Affected product

Movable Type

Six Apart Ltd.

All Movable Type CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-44392

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-44392

jvn.jp

https://jvn.jp/en/jp/JVN66473735/

movabletype.org

https://movabletype.org/news/2026/05/mt-908-released.html

www.sixapart.jp

https://www.sixapart.jp/movabletype/news/2026/05/20-1100.html