Michael Salzer » Guestbox : Security Vulnerabilities, CVEs,

Michael Salzer Guestbox 0.6, and other versions before 0.8, allows remote attackers to obtain the source IP addresses of guestbook entries via a direct request to /gb/gblog.

Multiple cross-site scripting (XSS) vulnerabilities in Michael Salzer Guestbox 0.6, and other versions before 0.8, allow remote attackers to inject arbitrary web script or HTML via (1) HTML tags that follow a "http://" string, which bypasses a regular expression check, and (2) other unspecified attack vectors.

Michael Salzer Guestbox 0.6, and other versions before 0.8, allows remote attackers to post an admin comment to a guestbook entry via a certain modified form, possibly related to the nummer parameter.