2.8.6 repairs 2 safety and security issues that can be manipulated by signed up, visited customers that have uploading opportunities. If you have untrusted writers on your blog site, updating to 2.8.6 is suggested.
The initial trouble is an XSS susceptability in Press This uncovered by Benjamin Flesch. The 2nd trouble, uncovered by Dawid Golunski, is a problem with disinfecting uploaded data names that can be manipulated in particular Apache setups. Many thanks to Benjamin as well as Dawid for searching for as well as reporting these.