Jesus Olmos Gonzalez has reported a vulnerability in wwwstats, which can be exploited by malicious people to conduct script insertion attacks.
Input passed to the "link" parameter in clickstats.php is not properly sanitised before being stored. 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 the malicious data is viewed.
The vulnerability is reported in version 3.21. Prior versions may also be affected.
Solution: Update to version 3.22.
Provided and/or discovered by: Jesus Olmos Gonzalez
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