Published:2008/04/04  Last Updated:2008/05/21

Mozilla Firefox cross-site scripting vulnerability


Mozilla Firefox web browser contains a cross-site scripting vulnerability.

Products Affected

  • Firefox prior to

    • Other applications such as Thunderbird and SeaMonkey that use Mozilla components may also be affected.
      For more information, refer to the vendor's website.


Mozilla Firefox does not properly handle certain HTML documents in Shift_JIS encoding. According to MFSA 2008-13, this flaw could potentially be used to evade web-site input filters and result in a XSS attack hazard.


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


Update the Software
Update to the latest version according to the information provided by the vendor.

Vendor Status

Vendor Link
Mozilla Foundation Mozilla Foundation Security Advisory 2008-13


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2008.04.04

Measures Conditions Severity
Access Required Routed - can be attacked over the Internet using packets
  • High
Authentication None - anonymous or no authentication (IP addresses do not count)
  • High
User Interaction Required Simple - 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
  • Medium
Exploit Complexity Low - little to no expertise and/or luck required to exploit (cross-site scripting)
  • High

Description of each analysis measures


NetAgent Co., Ltd. reported this vulnerability to IPA.
JPCERT/CC coordinated with the vendors under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
JVN iPedia JVNDB-2008-000021

Update History