Aliaksandr Hartsuyeu has reported a vulnerability in Doika Guestbook, which can be exploited by malicious people to conduct script insertion attacks.
Input passed to the "page" form field parameter in gbook.php is not properly sanitised before being used. 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 entry is viewed.
The vulnerability has been reported in version 2.5. Other versions may also be affected.
Solution: Edit the source code to ensure that input is properly sanitised.
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