t0pP8uZz has discovered a vulnerability in CcMail, which can be exploited by malicious people to bypass certain security restrictions.
The vulnerability is caused due to improper access restriction of the administrator page (admin.php) and potentially other pages. This can be exploited to bypass the authentication mechanism and gain access to administrative pages by setting a specially crafted "this_cookie" cookie.
The vulnerability is confirmed in version 1.0.1. Prior versions may also be affected.
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