Update the WordPress Gallery Photoblocks plugin to the latest available version (at least 1.1.43).
An unknown person discovered and reported this Cross Site Scripting (XSS) vulnerability in WordPress Gallery PhotoBlocks Plugin. This could allow a malicious actor to inject malicious scripts, such as redirects, advertisements, and other HTML payloads into your website which will be executed when guests visit your site. This vulnerability has been fixed in version 1.1.43.
CrossSite Request Forgery (CSRF) vulnerabilities
Multiple Authenticated Stored CrossSite Scripting (XSS) vulnerabilities
Toggle The Debug Mode via CrossSite Request Forgery (CSRF) vulnerability
Sensitive Information Disclosure vulnerability
Unauthenticated Reflected CrossSite Scripting (XSS) vulnerability