Secunia

http-equiv has reported a vulnerability in Microsoft Outlook Express, allowing malicious people (e.g. spammers and phishers) to load arbitrary content into the email client.

The problem is that Outlook Express normally prevents loading of content from external ressources, however, by creating a "BASE HREF" with target set to "_top" it is possible to make Outlook Express function as a browser. This effectively allows spammers and others to bypass content and spam filters if they can get the user to click the link.

No other security implications has currently been reported due to this error.

Reportedly Microsoft Outlook Express 6 is affected. Other versions may also be affected.

Solution
Filter HTML based emails.

Provided and/or discovered by
http-equiv

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