The (1) get_edit_post_link and (2) get_edit_comment_link functions in wp-includes/link-template.php in WordPress before 2.6.1 do not force SSL communication in the intended situations, which might allow remote attackers to gain administrative access by sniffing the network for a cookie.
JnSHosts PHP Hosting Directory 2.0 allows remote attackers to bypass authentication and gain administrative access by setting the "adm" cookie value to 1.
IBM WebSphere Portal 5.1 through 6.1.0.0 allows remote attackers to bypass authentication and obtain administrative access via unspecified vectors.