A vulnerability has been reported in Serendipity, which can be exploited by malicious people to conduct script-insertion attacks.
Input passed via links in RSS feeds is not properly sanitised in the Remote RSS sidebar plugin before being used. This can be exploited to insert arbitrary HTML and script code, which is then executed in a user's browser session in context of an affected site when malicious RSS feeds are viewed.
The vulnerability is reported in versions prior to 1.2.1.
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