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Vulnerability record · CVE-2020-5669 · published 26 October 2021

CVE-2020-5669: Sixapart movable type cross-site scripting vulnerability

SSixapart · Movable Type

Cross-site scripting vulnerability in Movable Type Movable Type Premium 1.37 and earlier and Movable Type Premium Advanced 1.37 and earlier allows a remote authenticated attacker to inject an arbitrary script via unspecified vectors.

5.4 CVSS 3.1 Medium EPSS 0.61% · top 53.1% CWE-79 · Cross-site scripting
5.4CVSS 3.1 base score, v2 3.5
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Cross-site scripting vulnerability in Movable Type Movable Type Premium 1.37 and earlier and Movable Type Premium Advanced 1.37 and earlier allows a remote authenticated attacker to inject an arbitrary script via unspecified vectors.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://jvn.jp/en/jp/JVN94245475/index.html Third Party Advisory
https://www.sixapart.jp/movabletype/news/2020/11/18-1101.html Vendor Advisory
https://jvn.jp/en/jp/JVN94245475/index.html Third Party Advisory
https://www.sixapart.jp/movabletype/news/2020/11/18-1101.html Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-5669), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.