Security problem

Hello,
wordfence show an security problem.
Need help.
Regards
Rainer

Plugin Name: Master Slider Current Plugin Version: 3.11.0
Details: To protect your site from this vulnerability, the safest option is to deactivate and completely remove “Master Slider” until a patched version is available. Get more information. (opens in new tab)Repository URL: https://wordpress.org/plugins/master-slider (opens in new tab)Vulnerability Information: https://www.wordfence.com/threat-intel/vulnerabilities/id/cebe27ca-ab29-48dd-bb3c-bcbe8573889b?source=plugin (opens in new tab)Vulnerability Severity: 6.4/10.0 (Medium)

The page I need help with: [log in to see the link]