CVE-2021-20812

moderate-risk

Published 2021-08-26

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.

Do I need to act?

0.35% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 6.1/10 Medium

NETWORK / LOW complexity

Affected Products (2)

Movable Type

Affected Vendors

Sixapart

References (4)

Third Party Advisory https://jvn.jp/en/jp/JVN97545738/index.html

Release Notes https://movabletype.org/news/2021/08/mt-780-681-released.html

Third Party Advisory https://jvn.jp/en/jp/JVN97545738/index.html

Release Notes https://movabletype.org/news/2021/08/mt-780-681-released.html

/ 100

moderate-risk

Severity 23/34 · High

Exploitability 1/34 · Minimal

Exposure 7/34 · Low