There have been a lot of users sending malicious links (spam, phishing, etc.) to users using wallet memos. I submitted a pull request to warn users about clicking on links that they see in their wallet.
The text will read:
Beware of spam and phishing links in transfer memos. Do not open links from users you do not trust. Do not provide your private keys to any third party websites.
It will be above the transactions in the history section of a user's wallet:
The pull request can be viewed here:
https://github.com/steemit/condenser/pull/1822
The PR is not accepted yet and there is no guarantee it will be approved, but I plan to work with Steemit, Inc. to make any edits necessary to try and get it approved. Hopefully we will see the changes up on the live site soon!