CVE-2025-54856: XSS (CVSS 4.8)

Description

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.

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CVSS v3.1 Score

4.8

MEDIUM

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

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

References

Other References

https://jvn.jp/en/jp/JVN24333679/ https://movabletype.org/news/2025/10/mt-880-released.html https://www.sixapart.jp/movabletype/news/2025/10/22-1055.html

Frequently Asked Questions

What is CVE-2025-54856? +

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. It has a CVSS v3.1 base score of 4.8 (MEDIUM).

How severe is CVE-2025-54856? +

CVE-2025-54856 has a CVSS v3.1 score of 4.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2025-54856? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-54856