Published:2011/07/08  Last Updated:2011/07/08

Internet Explorer vulnerable to cross-site scripting


Microsoft Internet Explorer contains a vulnerability in handling specific character encoding which may result in a cross-site scripting attack.

Products Affected

  • Internet Explorer 6
According to the developer, Internet Explorer 7 and later are not affected by this vulnerability.


Microsoft Internet Explorer contains a vulnerability in handling specific EUC-JP encoded characters, which may result in cross-site scripting.


An arbitrary script may be executed on the user's web browser.


Upgrade the Software
Upgrade to the latest version according to the information provided by the developer.

Vendor Status

Vendor Status Last Update Vendor Notes
Microsoft Japan Co.,Ltd. vulnerable 2011/07/08


JPCERT/CC Addendum

This JVN publication was delayed to 2011/07/08 after the developer fix was developed. From the fiscal year 2011, JPCERT/CC is using a new vendor coordination procedure. This new procedure came from the recommendation of the fiscal year 2010 "Study Group on Information System Vulnerability Handling" aimed at more timely JVN publications.

Vulnerability Analysis by JPCERT/CC

Analyzed on 2011.07.08

Measures Conditions Severity
Access Required can be attacked over the Internet using packets
  • High
Authentication anonymous or no authentication (IP addresses do not count)
  • High
User Interaction Required the user must be convinced to take a standard action that does not feel harmful to most users, such as click on a link or view a file
  • Mid
Exploit Complexity some expertise and/or luck required (most buffer overflows, guessing correctly in small space, expertise in Windows function calls)
  • Mid-High

Description of each analysis measures


Takeshi TERADA reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
JVN iPedia JVNDB-2011-000052