Redmine 5.x before 5.0.4 allows downloading of file attachments of any Issue or any Wiki page due to insufficient permission checks. Depending on the configuration, this may require login as a registered user.
Redmine before 4.2.9 and 5.0.x before 5.0.4 allows persistent XSS in its Textile formatter due to improper sanitization in Redcloth3 Textile-formatted fields. Depending on the configuration, this may require login as a registered user.
Redmine before 4.2.9 and 5.0.x before 5.0.4 allows persistent XSS in its Textile formatter due to improper sanitization of the blockquote syntax in Textile-formatted fields.
Redmine before 4.2.11 and 5.0.x before 5.0.6 allows XSS in the Textile formatter.
Redmine before 4.2.11 and 5.0.x before 5.0.6 allows XSS via thumbnails.
Redmine before 4.2.11 and 5.0.x before 5.0.6 allows XSS in a Markdown formatter.