Description

Movable Type contains a stored cross-site scripting vulnerability in Edit Comment. If crafted input is stored by an attacker, arbitrary script may be executed on a logged-in user's web browser. Note that Movable Type 7 series and 8.4 series, which are End-of-Life (EOL), are affected by the vulnerability as well.

INFO

Published Date :

2026-02-04T07:02:50.465Z

Last Modified :

2026-02-04T16:08:26.340Z

Source :

jpcert
AFFECTED PRODUCTS

The following products are affected by CVE-2026-21393 vulnerability.

Vendors Products
Six Apart
  • Movable Type
Six Apart Ltd
  • Movable Type
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21393.

URL Resource
https://jvn.jp/en/jp/JVN45405689/ cve-icon cve-icon
https://movabletype.org/news/2026/02/mt-906-released.html cve-icon cve-icon
https://www.sixapart.jp/movabletype/news/2026/02/04-1100.html cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact