GHSA-8FX9-5HX8-CRHM Apache Struts 2.0.1 uses an unintentional expression in a Freemarker tag instead of string literal

In Apache Struts 2.0.1 through 2.3.33 and 2.5 through 2.5.10.1, using an unintentional expression in a Freemarker tag instead of string literals can lead to a RCE attack...