Cross-site scripting vulnerability in Movable Type plugin A-Form versions prior to 4.1.1 (for Movable Type 7 Series) and versions prior to 3.9.1 (for Movable Type 6 Series) allows a remote unauthenticated attacker to inject an arbitrary script.
https://www.ark-web.jp/movabletype/blog/2022/09/a-series-411-391.html
https://www.ark-web.jp/blog/archives/2022/09/a-series-411-391.html