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CVE-2025-54856

Good to know:

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Date: October 22, 2025

Movable Type contains a stored cross-site scripting vulnerability in Edit ContentData page. If crafted input is stored by an attacker with "ContentType Management" privilege, an arbitrary script may be executed on the web browser of the user who accesses Edit ContentData page.

Severity Score

Related Resources (5)

https://jvn.jp/en/jp/JVN24333679/
https://movabletype.org/news/2025/10/mt-880-released.html
https://nvd.nist.gov/vuln/detail/CVE-2025-54856
https://www.sixapart.jp/movabletype/news/2025/10/22-1055.html
https://www.mend.io/vulnerability-database/CVE-2025-54856

Severity Score

Weakness Type (CWE)

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-79

Top Fix

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Upgrade Version

Upgrade to version https://github.com/movabletype/movabletype.git - mt7.906.5;https://github.com/movabletype/movabletype.git - mt8.0.8;https://github.com/movabletype/movabletype.git - mt8.4.4;https://github.com/movabletype/movabletype.git - mt8.8.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): REQUIRED
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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