CVE-2021-34634
The Nifty Newsletters WordPress plugin is vulnerable to Cross-Site Request Forgery via the sola_nl_wp_head function found in the ~/sola-newsletters.php file which allows attackers to inject arbitrary web scripts, in versions up to and including 4.0.23.
Date published : 2021-08-05
https://plugins.trac.wordpress.org/browser/sola-newsletters/trunk/sola-newsletters.php#L774