Yesterday, the WordPress plugin Quiz And Survey Master was closed on WordPress Plugin Directory. Due to that being one of the 1,000 most popular plugins in that directory (it has 40,000+ installs), our systems warned us about the closure and we started checking over the plugin to see if there was a vulnerability we should be warning customers of our service about if they are using the plugin.
In June, while looking in the possibility there had been a vulnerability fixed in the plugin, we found a fairly serious vulnerability in the plugin, so the poor quality of the security we found this time wasn’t surprising. While we didn’t quickly find a serious vulnerability, we did easily confirm that there is a reflected cross-site scripting (XSS) vulnerability that currently exists in the plugin. [Read more]