LastPass has become aware of a vulnerability with its software.  When used with Internet Explorer (IE), passwords are exposed in plain text within memory.  While the vulnerability requires either physical or remote access to the machine to exploit the vulnerability, LastPass/IE users are urged to update their LastPass client as soon as possible to remove the vulnerability.  

Additional information about the vulnerability is available at:

http://securitywatch.pcmag.com/security/314821-lastpass-vulnerability-left-ie-passwords-exposed-update-now