Daniel Schreckling has reported some vulnerabilities in Horde, which can be exploited by malicious people to conduct script insertion attacks.
The vulnerabilities are caused due to input validation errors in the gzip/tar and css MIME viewers. This can e.g. 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 mail with a specially crafted inline attachment is viewed with the IMP webmail client.
The vulnerabilities have been reported in versions prior to 3.0.7.
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