Russ McRee has discovered a vulnerability in SignMe, which can be exploited by malicious people to conduct cross-site scripting attacks.
Input passed via the "hash" parameter to signme.inc.php is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.
The vulnerability is reported in 1.5 and confirmed in 1.55. Other versions may also be affected.
Solution: Edit the source code to ensure that input is properly sanitised.
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