Internet Explorer 5.x and Microsoft Outlook allows remote attackers to read arbitrary files by redirecting the contents of an IFRAME using the DHTML Edit Control (DHTMLED).
The IFRAME of the WebBrowser control in Internet Explorer 5.01 allows a remote attacker to violate the cross frame security policy via the NavigateComplete2 event.
Internet Explorer 4.x and 5.x does not properly verify the domain of a frame within a browser window, which allows a remote attacker to read client files via the frame, aka the "Frame Domain Verification" vulnerability.
Internet Explorer 5 does not modify the security zone for a document that is being loaded into a window until after the document has been loaded, which could allow remote attackers to execute Javascript in a different security context while the document is loading.