Safari Security Hole Allows Cookie Theft
An anonymous reader writes "MacSlash posted a story about a vulnerability in Safari. The exploit allows someone to steal any of your domain-based cookies (passwords, private info, etc.) from any website. Mozilla and Internet Explorer had the same bug in the past."
If the web app allows you to edit your information once you've aquired an authorized session, then stealing that authorized session could allow someone to hijack your information and/or your identity with that web app/company.