Internet Explorer 5.5 and 6.0 allows remote attackers to bypass restrictions for executing scripts via an object that processes asynchronous events after the initial security checks have been made.

Microsoft Internet Explorer 5.01, 5.5 and 6.0 treats objects invoked on an HTML page with the codebase property as part of Local Computer zone, which allows remote attackers to invoke executables present on the local system through objects such as the popup object, aka the "Local Executable Invocation via Object tag" vulnerability.

Microsoft Internet Explorer 4.0 through 6.0 could allow local users to differentiate between alphanumeric and non-alphanumeric characters used in a password by pressing certain control keys that jump between non-alphanumeric characters, which makes it easier to conduct a brute-force password guessing attack.

Microsoft Internet Explorer 6.0 and earlier allows malicious website operators to cause a denial of service (client crash) via JavaScript that continually refreshes the window via self.location.

Internet Explorer 6.0 allows remote attackers to execute arbitrary code by modifying the Content-Disposition and Content-Type header fields in a way that causes Internet Explorer to believe that the file is safe to open without prompting the user, aka the "File Execution Vulnerability."

Internet Explorer 5.5 and 6.0 allow remote attackers to read certain files via HTML that passes information from a frame in the client's domain to a frame in the web site's domain, a variant of the "Frame Domain Verification" vulnerability.

Internet Explorer 5.5 and 6.0 allows remote attackers to read and modify user cookies via Javascript in an about: URL, aka the "First Cookie Handling Vulnerability."

Internet Explorer 5.0, and possibly other versions, may allow remote attackers (malicious web pages) to read known text files from a client's hard drive via a SCRIPT tag with a SRC value that points to the text file.

Internet Explorer 5.5 and 6.0 allows remote attackers to cause the File Download dialogue box to misrepresent the name of the file in the dialogue in a way that could fool users into thinking that the file type is safe to download.

Internet Explorer 5.50.4134.0100 on Windows ME with "Prompt to allow cookies to be stored on your machine" enabled does not warn a user when a cookie is set using Javascript.