Use of Less Trusted Source in Six Apart Ltd products - CVE-2025-53522

Vulnerability identifier: #VU114232

CSH Severity: Medium

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2025-53522

CWE-ID: CWE-348

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vendor: Six Apart Ltd

Affected software:
Movable Type
Movable Type Advanced
Movable Type Premium
Movable Type Cloud Edition
Movable Type Premium Cloud Edition
Movable Type Premium (Advanced Edition)

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to use of less trusted source. A remote attacker can send a tampered email to reset a password.

Install updates from vendor's website.

• https://jvn.jp/en/jp/JVN76729865/index.html
• https://movabletype.org/news/2025/08/mt-843-released.html