CVE-2021-20812

MEDIUM 6.1CVE-2021-20812 · Published 26/08/2021 · updated 17/06/2026

In short

CVE-2021-20812 is a MEDIUM (CVSS 6.1) vulnerability affecting movable type (sixapart).
Chance of exploitation in the next 30 days (EPSS): 0.90%, higher than 59.7% of all vulnerabilities.
Fix: update to 7.8.0 or later.

Package	Affected versions	Patched versions
movable type sixapart	`≥ 7.0, < 7.8.0≤ 1.44`	`7.8.0`

Description

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.

References

jvn.jp/en/jp/JVN97545738/index.html · Third Party Advisory
movabletype.org/news/2021/08/mt-780-681-released.html · Release Notes

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Package

Affected versions

Patched versions

movable type

sixapart

≥ 7.0, < 7.8.0≤ 1.44

7.8.0

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