From TN 1610553, but i was advised last week and it´s now public
Symptoms: 
After installing CCF16 user might experience incorrect encoding including but not limited to 
Additional attributes for a link 
Linking descriptions for a link 
Linking text for a link 
Link target: “Name” option for a link 
Query string for a link 
Alternate text for an image 
Html name for an image 
Additional attributes for an image  
This affects inserting a link or image from within a rich text field as well as authoring link/image components and elements. 
The incorrect encoding will primarily apply to the characters ‘, “, , < and > 
Resolution: 
PM72259 will resolve this issue. This should be installed on top of CCF16. 
CCF17 will also resolve this issue. Until CCF17 is available, it is strongly recommended  that PM72259 be installed on top of CCF16 . Another less ideal option to avoid this behaviour is a downgrade to CCF15.