Action Text brings rich text content and editing to Rails. Instances of ActionText::Attachable::ContentAttachment included within a rich_text_area tag could potentially contain unsanitized HTML. This vulnerability is fixed in 7.1.3.4 and 7.2.0.beta2.
https://github.com/rails/rails/security/advisories/GHSA-prjp-h48f-jgf6
https://github.com/rails/rails/commit/e215bf3360e6dfe1497c1503a495e384ed6b0995