The protocolIs function in platform/KURLGoogle.cpp in WebCore in WebKit before r55822, as used in Google Chrome before 4.1.249.1036 and Flock Browser 3.x before 3.0.0.4112, does not properly handle whitespace at the beginning of a URL, which allows remote attackers to conduct cross-site scripting (XSS) attacks via a crafted javascript: URL, as demonstrated by a \x00javascript:alert sequence.

Flock beta 1 0.7 allows remote attackers to cause a denial of service (application crash) via a web page that contains a large number of nested marquee tags, a related issue to CVE-2006-2723.

Mozilla Firefox 3.5.1 and SeaMonkey 1.1.17, and Flock 2.5.1, allow context-dependent attackers to spoof the address bar, via window.open with a relative URI, to show an arbitrary file: URL after a victim has visited any file: URL, as demonstrated by a visit to a file: document written by the attacker.

Cross-site scripting (XSS) vulnerability in Flock Browser 3.0.0.3989 allows remote attackers to inject arbitrary web script or HTML via a crafted bookmark.

Cross-site scripting (XSS) vulnerability in Flock Browser 3.x before 3.0.0.4114 allows remote attackers to inject arbitrary web script or HTML via a crafted RSS feed.