Juan Pablo Lopez Yacubian has discovered a vulnerability in SmarterMail, which can be exploited by malicious people to conduct script insertion attacks.
Input passed via the subject of an email is not properly sanitised before being displayed. This can be exploited to insert arbitrary HTML and script code, which is executed in a user's browser session in context of an affected site when a specially crafted email is viewed.
The vulnerability is confirmed in SmarterMail Free Edition build 4.3.2903. Other versions may also be affected.
Solution: Filter malicious characters and character sequences in a proxy.
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