Direct static code injection vulnerability in error.php in GuppY 4.5.9 and earlier, when register_globals is disabled, allows remote attackers to execute arbitrary PHP code via the _SERVER[REMOTE_ADDR] parameter, which is injected into a .inc script that is later included by the main script.

Directory traversal vulnerability in printfaq.php in EasyGuppy (Guppy for Windows) 4.5.4 and 4.5.5 allows remote attackers to read arbitrary files via ".." sequences in the pg parameter, which is cleansed for XSS but not directory traversal.

Multiple cross-site scripting (XSS) vulnerabilities in GuppY 4.5.3a and earlier allow remote attackers to inject arbitrary web script or HTML via (1) the pg parameter to printfaq.php, or the (2) Referer or (3) User-Agent HTTP headers, which are not properly handled by error.php.