Two weeks ago a user, yuyang998, on the wordpress.org Support Forum disclosed that the plugin Simple Newsletter Plugin has either a persistent or reflected cross-site scripting (XSS) vulnerability. On the thread for one of their others disclosures, we asked if they would be disclosing the details of them somewhere and didn’t get an answer in their response, so we will go ahead and provide the details of what might be the vulnerability that they were referring to.

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This post provides insights on a vulnerability in the WordPress plugin Simple Newsletter Plugin not discovered by us, where the discoverer hadn't provided the details needed for us to confirm the vulnerability while we were adding it to the data set for our service, so the rest of its contents are limited to subscribers of our service.

If you were using our service, you would have already been warned about this vulnerability if your website is vulnerable due to it. You can try out our service for free and then see the rest of the details of the vulnerability.

For existing customers, please log in to your account to view the rest of the contents of the post.