Comment 2 for bug 1717542

If you believe you have encounter a security issue, please mark it as such and don't mark as public.

That said, I believe this is indeed addressed in the comments on the linked fixed issue: https://bugs.launchpad.net/horizon/+bug/1567673 as the escape sequence is not the default. The results of any automated checker should be double checked. If you can provide more details and information that there is indeed still an issue, please update.