Discourse: Stored XSS in "post last edited" option

There are two users: Attacker and Victim. 2. Attacker starts a private talk via private message with the Victim. 3. Attacker send a message to Victim, then he edits it or deletes it. 4. Victim sees the yellow pencil, symbol of the edit. 5. Victim clicks on yellow pencil to see the edit and the...