A vulnerability was found in Six Apart Movable Type, Movable Type Advanced and Movable Type Premium 8.4. It has been classified as problematic. The affected element is an unknown function of the component Edit Comment Handler. This manipulation causes cross site scripting. This vulnerability only affects products that are no longer supported by the maintainer.
This vulnerability is handled as CVE-2026-21393. The attack can be initiated remotely. There is not any exploit available.
