CVE-2021-20812

6.1 mediumEPSS 0.9%

Medium (6.1) in sixapart movable type. EPSS 0.9% chance of exploitation in the next 30 days.

Cross-site scripting vulnerability in Setting screen of Server Sync of Movable Type (Movable Type Advanced 7 r.4903 and earlier (Movable Type Advanced 7 Series) and Movable Type Premium Advanced 1.44 and earlier) allows remote attackers to inject arbitrary script or HTML via unspecified vectors.

Severity

CVSS 3.1

6.1 medium

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

EPSS: 0.9% chance of exploitation in the next 30 days; higher than 59% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2021-08-26
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

sixapart:movable_type

References

https://jvn.jp/en/jp/JVN97545738/index.html
https://movabletype.org/news/2021/08/mt-780-681-released.html
https://jvn.jp/en/jp/JVN97545738/index.html
https://movabletype.org/news/2021/08/mt-780-681-released.html

Check your stack JSON