I'd suggest you direct that question staight to Atlassian. To my knowledge, JIRA and Confluence do not use struts, but versions of WebWork from before it was merged into struts. Since the vulnerability was introduced in struts 2.3.5 (after WebWork was merged), I'm mildly optimistic that we're fine.
However, lacking more detail on how the bug was introduced, one shouldn't rule out that it was present in earlier versions of WebWork.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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