The send_welcome_email_url() function doesn't use esc_url() on the output of add_query_arg(), which is the suggested fix for plugins which were affected by the WP 4.1.2 Security Release. You do pass it to wp_nonce_url(), which uses esc_html(). But this may not be enough to address the security issue.
atwellpub
commented
8 years ago
The send_welcome_email_url() function doesn't use esc_url() on the output of add_query_arg(), which is the suggested fix for plugins which were affected by the WP 4.1.2 Security Release. You do pass it to wp_nonce_url(), which uses esc_html(). But this may not be enough to address the security issue.
See this post for details: https://blog.sucuri.net/2015/04/security-advisory-xss-vulnerability-affecting-multiple-wordpress-plugins.html