A new flaw has been found in Internet Explorer by security firm Secunia through research into another vulnerability present in the browser. The issue was initially believed to be a successful exploit of a problem discovered last week, however Microsoft said it was actually a new flaw.

Researcher Anreas Sandblad discovered the vulnerability, which Secunia has issued an advisory for and rates as "highly critical." Like the previous problem, the bug is in the handling of the OBJECT HTML tag. In this flaw, memory can be corrupted to compromise the user's system.