CVE-2021-24241
The Advanced Custom Fields Pro WordPress plugin before 5.9.1 did not properly escape the generated update URL when outputting it in an attribute, leading to a reflected Cross-Site Scripting issue in the update settings page.
Date published : 2021-04-22
https://wpscan.com/vulnerability/d1e9c995-37bd-4952-b88e-945e02e3c83f
https://github.com/jdordonezn/Reflected-XSS-in-WordPress-for-ACF-PRO-before-5.9.1-plugin/issues/1