Input validation vulnerability in Timeline and History slider 2.3

The Timeline and History slider plugin for WordPress has a security vulnerability that could potentially allow hackers to access and run any files on the server. This can be done by manipulating the ‘design’ attribute of the plugin’s shortcode. Attackers with Contributor-level access or higher could exploit this vulnerability to bypass security measures and gain access to sensitive information or execute malicious code. This is a serious issue that could affect all versions of the plugin up to 2.3.