One of the changelog entries for the latest version of Easy Testimonial Slider is “Improve security”. Looking at the changes made in that version we found a lot of changes that could be related to a vulnerability, so we checked the previous version of the plugin with our Plugin Security Checker tool to see if that would identify any possible issues that we could then look further in to. Through that we found that at least a reflected cross-site scripting (XSS) vulnerability had been fixed in the new version.

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