Ivan Markovic has discovered a vulnerability in SquirrelMail, which can be exploited by malicious people to conduct script insertion attacks.
Input passed as HTML parts of e-mail messages is not properly sanitised for malformed HTML before being viewed. This can be exploited to inject arbitrary HTML and script code, which will be executed in a user's browser session in context of an affected site when a malicious e-mail message is opened.
Successful exploitation requires that "Show HTML Version by Default" is enabled in "Options -> Display Preferences".
The vulnerability is confirmed in version 1.4.16 and reported in version 1.4.15. Prior versions may also be affected.
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Subject: SquirrelMail Malformed HTML Mail Message Script Insertion
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