One of the changelog entries for the latest version of FV Player (FV Flowplayer Video Player) is “Security – fix for XSS vulnerability in email subscription”. When we started to look into that what we found is not only that there had been persistent cross-site scripting (XSS) vulnerability fixed in the email subscription functionality, but there is also another another vulnerability in that same functionality, which we will disclose in a follow up post.

...

---

This post provides insights on a vulnerability in the WordPress plugin FV Flowplayer Video Player 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.