Google Chrome ( 5.0.375.127 and previous versions) suffers from HTTP Auth Dialog spoofing vulnerability due to possible realm manipulation in the HTTP header.
This bug was actually patched. The issue mentioned in this bug was dialog spoofing due to long sub domain names. The patch worked only for that specific case which was outlined in that bug. There are number of tests have been conducted on Google Chrome which verifies the inefficiency of Google Chrome to scrutinize the type of realm value set in the header. It can be tampered with double quotes and single quotes used in a definite manner.
Source: Aditya K Sood’s Blog