Stored Cross-Site Scripting Vulnerability in Movable Type by SixApart
CVE-2026-22875

4.8MEDIUM

Key Information:

Vendor

Six Apart Ltd.

Status
Movable Type (software Edition)
Movable Type Advanced (software Edition)
Movable Type Premium (software Edition)
Movable Type Premium (advanced Edition) (software Edition)
Vendor
CVE Published:
4 February 2026

What is CVE-2026-22875?

Movable Type is susceptible to a stored cross-site scripting (XSS) vulnerability found in its Export Sites feature. When an attacker inputs malicious scripts that get stored, these scripts can be executed in the web browsers of users who are logged in. This poses a risk to user data and site integrity. The vulnerability primarily affects the End-of-Life Movable Type 7 series and 8.4 series. It is crucial for users and administrators to assess their environments and apply necessary security updates.

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Affected Version(s)

Movable Type (Cloud Edition) 9.0.5 (9 series)

Movable Type (Cloud Edition) 8.8.1 (8 series)

Movable Type (Software Edition) 9.0.4 to 9.0.5 (9.0 series)

References

https://movabletype.org/news/2026/02/mt-906-released.html
https://www.sixapart.jp/movabletype/news/2026/02/04-1100....
https://jvn.jp/en/jp/JVN45405689/

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

CVSS V3.0

Score:
5.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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