Before WordPress 4.9.5, the version string was not escaped in the getthegenerator function, and could lead to XSS in a generator tag.
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "4.9.5+dfsg1-1", "binary_name": "wordpress" }, { "binary_version": "4.9.5+dfsg1-1", "binary_name": "wordpress-l10n" }, { "binary_version": "4.9.5+dfsg1-1", "binary_name": "wordpress-theme-twentyfifteen" }, { "binary_version": "4.9.5+dfsg1-1", "binary_name": "wordpress-theme-twentyseventeen" }, { "binary_version": "4.9.5+dfsg1-1", "binary_name": "wordpress-theme-twentysixteen" } ] }