Microsoft FrontPage Server Extensions Cross-Site Scripting Vulnerability



Date Discovered

April 11, 2006


Microsoft FrontPage Server Extensions are prone to a cross-site scripting vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input before it is rendered to other users. An attacker may leverage this issue to have arbitrary script code executed in the browser of an unsuspecting user, with the privileges of the victim user’s account. This may help the attacker steal cookie-based authentication credentials and launch other attacks.

Technologies Affected

  • Microsoft FrontPage Server Extensions 2002
  • Microsoft SharePoint Team Services 2002
  • Microsoft Windows Server 2003 Datacenter Edition Itanium
  • Microsoft Windows Server 2003 Datacenter Edition Itanium SP1
  • Microsoft Windows Server 2003 Enterprise Edition Itanium
  • Microsoft Windows Server 2003 Enterprise Edition Itanium SP1
  • Microsoft Windows Server 2003 Enterprise Edition SP1
  • Microsoft Windows Server 2003 Enterprise x64 Edition
  • Microsoft Windows Server 2003 Standard Edition SP1
  • Microsoft Windows Server 2003 Standard x64 Edition
  • Microsoft Windows XP Home SP2
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Professional SP2
  • Microsoft Windows XP Professional x64 Edition


Block external access at the network boundary, unless external parties require service.
Filter access to the affected computer at the network boundary if global access isn't required. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Run all software as a nonprivileged user with minimal access rights.
Attackers may successfully exploit client flaws in the browser through cross-site scripting vulnerabilities. When possible, run client software as regular user accounts with limited access to system resources. This may limit the immediate consequences of client-side vulnerabilities.

Do not follow links provided by unknown or untrusted sources.
Web users should be cautious about following links to sites that are provided by unfamiliar or suspicious sources. Filtering HTML from emails may help remove a possible vector for transmitting malicious links to users.

Set web browser security to disable the execution of script code or active content.
A successful exploit of cross-site scripting issues often requires executing malicious script code in web clients; consider disabling support for script code and active content within a client browser. Note that this mitigation tactic might adversely affect legitimate websites that rely on the execution of browser-based script code.

The vendor has released fixes to address this issue; please see the reference section for further details.



Esteban Martínez Fayó is credited with the discovery of this vulnerability.

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