[Defender] WordPress

Hello,

since two days I get this message from Defender for a few sites (not all). All sites are running the latest wordpress version. I don't know what this message means and what to do.

##############################
WordPress Vulnerability
Version: 4.9.6
WordPress <= 4.9.6 - Authenticated Arbitrary File Deletion (unpatched)

Vulnerability type: UNKNOWN
This bug has been fixed in version:
##############################